The stress is going to make me crack; I feel like I'm going insane.?

I literally feel like I'm losing my mind. I broke up with my boyfriend of 2 1/2 years about a month ago. Since then, I've gone from guy to guy, one being my previous ex-bf. I slept with him, fell for him once again and was convinced that something could be made from it. He tells me he wants it to be nothing but "casual". I'm also working for someone who's verbally abusive, many of my friends and friendships have faded, moved away, etc. I'm not in school until this September which leads me to feel very useless. Ahhh, and my dad's a mean drunk. I find myself secluded in my bedroom at this d*mn machine most of the time, alone with my thoughts. But I can't bombard my mom and friends all the time to get away from it all. Something happened this afternoon and I felt a surge of emotion. I gripped the sides of my desk and just bawled. I can't handle these things anymore, guys. Any words of wisdom, PLZ. ANYTHING -- negative, positive, BLUNT if anything else.