What Causes Uncontrollable Vomiting, Dark Circle Around Eyes And Severe Menstrual Pain?

My name is Raven. And I've started throwing up uncontrollably yesterday and is continuing today. I can not figure out why I am! I dont have diarhea but my stomach does gurlge. My eyes have dark circles under them and if I dont vomit or go back to sleep it gets worse. Yesterday when I threw up there was something that looked like fish bait (flourescent green and orange) within my vomit. I am menstrating and yes it is painful!!!! I went to the hospital and they just said I was over weight. I mean I've always been this weight category and it doesnt make sense. I was kind of thinking it could be a miscarriage that I have endured back in August of 2010...but I dunno' maybe they forgot to take something out at the time?? I'm worried but hopefully you can help me. Pleeeease!