What should I do about this?

I'm experiencing a lot of pain in my stomach after I eat, and pangs of pain occasionally within an hour of eating. I feel like, every time I get up, I'm going to faint or pass out. My chest is hurting, too, especially on the left side, more where the heart is. I don't think it could be a heart attack coming, because I don't have the symptoms of a heart attack, apart from chest pains. I'm bulimic, and have thrown up five times in the past 24 hours. Is that the cause? I've been throwing up for almost two years now. But have had an eating disorder my whole life. What do I do?