I'm 14( 15 tomorrow ) and the past few days ive had abdominal pains but today I woke up feeling very sick, I got up anyway started my day. when I arrived at school I felt much better, but around 12 during class I threw up a lot of yellow bile, then about 30 minutes later I did it again, I didn't have any other symtoms but now it hurts to stand and feels as if I have knives in my lower stomach and when I stand I get very dizzy. the pains hurt so bad when I'm laying down, walking (I have to walk hunched over bc it hurts so bad) and I feel very weak like my legs could give out at any moment.