What is happening?

I was walking home three days ago…I don't usually write my life down, but I feel the need to do this all of the sudden. I felt watched as I walked home from school. In my paranoid mind, I always feel that way, but this felt different. I can't describe it, but something was dreadfully wrong that day. I wish I could place just how wrong it felt. The air stood still. No birds, no traffic, no wind, not even a dog. I live in a suburb by a highway, and not a sound!
Then I saw something odd. It was in the distance, far enough away to be distorted by the summertime mirage that you see down long roads. It was a tall man in a suit. I couldn't quite tell, he was too far away. I stopped and stared. I don't know why. He started walking towards me, but his movement wasn't normal. He moved like he was underwater, and his limbs sort of stretched and bent like they were stiff tentacles. As he slowly moved closer, I saw that his skin was deathly white. As he approached he seemed to get taller and thinner. With all my willpower, I forced myself to run away. I constantly looked behind myself only to see him behind me, moving that same slow and creepy gait. No normal man walked like that. He walked slower than me, and I could see him fall behind every time I looked back, but once I looked forward, it seemed he rematerialized behind me. These woods are familiar to me. Every kid in this neighborhood knows their way around this forest. In my panic, it seemed darker than normal for 4:15 in the afternoon. A wispy mist covered some of the lower grounds, but nothing quite blinding. I reached the other side of the woods that spilled into an adjacent highway. Normally I don't like walking by busy roads, but now I welcomed the noise. My heart slammed in my throat, and my heavy backpack made my back throb in sync. I had actually taken a short-cut to my house, but that didn't make the experience better. Here I pulled out my phone to tell my mother I was going to be a bit late, but when I opened the phone, all I saw on the screen was static, like an old television running on a bad signal. I walked as fast as my aching limbs would allow. It didn't matter much; as I ended up getting home 30 minutes later than usual. I told her that I just stopped to chat with friends, but I know she didn't buy it. I was drenched in the sweat that comes from a sprint fueled by adrenaline. My face was a bit white after I looked at it in the mirror. After I hot-footed my way around the truth, I went to my room and closed the blinds. One slip of paper made its way to my pocket… I don't know where it came from. Maybe my friends slipped it to me in class. It was a normal piece of notebook paper with a large "X" inside of a circle scribbled on it, as well as some other crap I couldn't read. It looked like something that would be drawn by a mental patient. I packed it away as if it was somehow important and continued my night, trying to forget the whole ordeal. I did a good job pushing it down, but it kept nagging at my mind.
That night, I saw shadows on my wall from my half-closed blind. I'd been a bit sloppy when I closed them, but I made out the distinct shadow of a tall, thin man walking past in the light of the crescent moon. I shut my eyes as hard as I could, as if it would somehow ward off the stranger outside.  After lying under hot, sweltering covers for hours, I gathered my courage to look at the window.  I peeled down a shutter and looked outside hastily with wide, under slept eyes. To my relief, I saw nothing. I did, however, notice a storm of tiny red marks on the glass. They're too thin to see clearly without my glasses, but they don't exactly seem like they were put there. I completely shut the blind and fell into an uneasy sleep filled with nightmares. I woke up the next morning, feeling ready to scream. I wish I remembered what I saw, because I threw up on my covers and was drenched in this sweat. My morning then was a bit more typical. That day seemed like a distant nightmare. I was glad as I walked out of my house. The first thing I noticed was the uneasy quiet. Then the cloud cover. Then the mist. That familiar dryness comes to my mouth. I really don't want to walk to the bus stop today. Not in this isolation.  But I had to. I had no choice. Besides the symptoms of an incredibly bad dream, I had no reason to stay home. I walked fast to the entrance of my neighborhood. I wish there weren't all these trees around here. It feels like something is hiding in them whenever I look at them. Ever since that day three days ago, I'm terrified of trees. I didn't see anything, but I felt something. For one fleeting moment, I thought I heard this low, guttural moan. I stopped dead as my hand drifted to a pencil as if it were a knife.
Again, silence and isolation in the mist. The mist seemed to thicken after I started to the bus stop, and was so thick I saw nothing but the stop sign when I got there. The sign was the only land marker in sight. After waiting 5 ungodly minutes, the bus finally came. I was sorely tempted to cuss out the bus driver, and barely held myself back. I mean, in a mist this thick, how could she responsibly drive faster? I sat down in my usual seat, shivering in a sudden coldness that had gripped me, and intense anger that I couldn't explain. After ten minutes, the anger melts away into fear. It's the kind of fear you get in high-pressure situations that makes you want to throw up. The sugary cereal that I ate for breakfast rises to my throat, and I taste that disgusting mixture of bile and sugar. I can't take my eyes off of this mist. The loud, obnoxious voices of the other kids seems to be distant. I can't hear them as I stare out into the white. As we pull into school, I see the shape of a tree…at least I think.  It was tall, taller than the bus. I thought I saw a tie and white shirt, but I think that was my imagination. My whole school day goes terribly. My stomach never lets up on me. After lunch I'm holding my gut. I've been nervous for so long it feels like I've got ulcers. I can't talk to my friends without cussing them out. That day I tried to talk as little as possible, to preserve those friendships. I knew I was pale, but I couldn't tell them why. Every time I tried, the words wouldn't come. I was aching to tell them, even if it made me insane, but all I could manage was a smile. It worries them, I can see it. Even my girlfriend was unfortunate enough to push the matter. I sent her away crying. I spent the rest of that period in the bathroom, silently crying. What was happening? What was going on? Who was this man? I thanked God for the end of the day and was so eager to get home, I forgot to step on the bus. It wasn't very smart to walk home. Not at all. Not only because I felt stalked, but because the mist had lingered the whole day. The risen sun made things marginally better at best. That whole walk home was a mixture of fear and physical pain from my stomach. Maybe it's more than being nervous…I'll check with the doctor. Every tree I see frightens me. Out of the corners of my eys, I see the trees move. Their long branches become fingers.
Long tendrils of fingers more than a foot long, and pointed at the tip. Every time I looked back, there was nothing. Nothing but mist and trees. At one point, I was almost run over by a truck driver. He was nice and let me off, but I saw that worried glint in his eyes. My hair's been plastered to my forehead for so long, I've almost given up washing it. The walk lasted long, too long for my liking. I followed all of my usual roads, but they seemed stretched beyond their usual length. I caught another lecture from my parent when I finally got home. They went easy on me, though. It's obvious that I'm on edge.
Today, I walked home again, my worst decision yet. The mist lingered overnight. I'll skip everything that went on in school; I basically have no friends anymore, just worried pupils.  A trip to the guidance counselor is all I'll mention. The roads stopped today. Leaves overtook them on my walk, and then they just ceased to be. Even behind me, all I could see was forest. A tall man stood beside me. Up close, I couldn't look at him. My eyes kept blurring like I was going to pass out. God help me, I have a monster following me. He is indeed wearing a suit, but he's not…human. No human can bend like him. No human can stretch like him. No human can speak like him. I felt both terrified and at peace by him, but my fear won over the peace this time. I ran, dropping my backpack. Without the extra weight, I flew ahead of him easily. At one point, I felt cold tendrils around my throat. They barely touched, but they were as cold as ice. I heard a voice in my head…But not quite a voice, not even words. It was more like a knowledge.
"The shadow in the dark has you. Come with me. We need you" it said.
Why do I want to copy this weird symbol over and over? What does it mean? I took the day off from school today. The mist has gotten so bad school was closed anyways. There's this weird interference with everything. The phones are either crackly or don't work. The TV goes in and out. The power is flickering for no reason at all. This is a small town in Tennessee. All around us are mountains. If the power goes out, it could be for weeks. I hate this silence, I hate this mist, and I HATE this fear!
I'm going to go mad. Earlier today, I stepped outside to prove to myself that there was nothing to fear. The mist subsided briefly for that time. There are clothes everywhere. Some of them have these brown stains on them. Some of them are torn to shreds. Still others seem perfectly fine. What the hell is going on around here?! There's a voice in my head now…I'll write the rest later, if I have the sanity.
I think I'll call my stalker a name, just to name my faceless fear…He's tall and thin…He's the Slender Man.