WHAT DISORDER HAVE I GOT?

I talk really fast and shout out loud different words, i do weird things like i have to bang my head on my bedroom wall so many times, like to a round number say (8) i feel as though i can never die, i sit and plan my own death out, i plan and speak out conversations i'm gunna have with people, i feel as though iv'e got so much anger built up in my head that one day im just going to break and kill loads of people, i get hot and sweaty easy, and i can go from really nice guy, to an evil monster in seconds, lets face it, my lifes finished.. Bye!!