Please help me, I don't know what to do any more.?

I can't think straight any more, all my mind is one big cluster of thoughts, none of which make logical sense, I swearer that I see things sometimes that apparently are not there at all, I get paranoid very easily now, I always feel as if someone is out to get me. I feel hollow & alone so much any more that I just want to avoid people, even my best friends & family emotionally I am a wreck, my emotions go up & down this way & that way all over, I got back into the habit of cutting myself, & I am also feeling suicidal as well latley, When I am driving I just want to slam my car into a wall or an on coming truck, just to end the hell I have to live in. My mind has a mind of it's own, like my thoughts are given to me, & I sware hear some voices sometimes, they tell me that I am worthless alot & sometimes they are the best thing, they give me encouragement wen I need it, I just don't know what to do any more.