what can I do about this?

[mikey]

My older brother (16) wants to kill me he's made it pretty obvious to me. I'm frightened to even go to sleep tonight. Also he loves fire, like loves it. He says that the flourescant orange and shapes make him happy. He sleeps with a knife under his pillow and he told me the voices want me dead. I know he needs helpbut I'm frightened about what he'll do to me if I tell on him.