Hey dude! I just have paranoia, general. Major paranoia. ANYWAYS, this is about you!
I really like Thalia's idea of singing loud in the shower! It makes you happy, and takes your mind off of things. Or listen to music.
When it comes to sleeping, I sleep with a nightlight. Seriously, I'm 15 going on 16 and still scared of the dark XD I also sleep with the radio on. And leave my door open just a bit, so I can hear everything in my house.
Also with sleeping, discuss this with your parents, and talk to them about considering taking meletonin (did I spell it right?). It is non-addictive and drug-free, but, hey, that's just what the radio commercials say! I personally don't take it, but I know other people who do. It will help you fall asleep and calm you down fast.
Idk if you are christian, but even if you aren't, maybe take what I'm about to say into consideration :) You are a child of God, and he is there to protect and watch over you. Even if something ever did happen, you would be in the most wonderful place ever- heaven! Plus side, no homework
I really hope everything works out for you! Just know I'm here if you ever need anything. Best of luck :)))