I'm so sorry this is happening. It is definitely not right. Your brother has some serious issues. I wish there was something you could do.
What happened last time you told someone??? There has got to be away to keep him away from you!
How old are you?? Is there anyone else in your family you can go live with?? Or even just spend some time there when your brother is around?
I'm thinking of you, and I hope you can find away to escape all this pain. Big hugs sent your way.