Can someone help me? I don't know what's wrong with me.?

About at least once a day, I have these almost episodes that last about 30 minutes to an hour, and I almost cry non-stop during these times. Usually feel almost dead inside during these times, and i feel like i have absolutely no reason to be alive, like everyone else would be better off without me. And usually if I feel really awful and the dead felling wont go away I'll start hurting myself, and I've started to starve myself as well. I don't know what I should do, because I feel like if I try to go to anyone about this they wont care or they will have something better to do at the time then listen. So what should I do, and can you tell me what's wrong with me?