Hi! i'm 15 113 lbs, and about almost two months ago i started feeling nauseous every single moment of the day. i went to my doctor and she just gave me prevacid cause she thinks it's too much acid irritating my stomach but it's only getting worse. i threw up in my mouth on Saturday, and today i randomly got dizzy and my heart felt like it was gonna beat it's way out of my body.. it ruins everything. especially concentration at school. my symptoms are nauseousness, stomach aches, dizziness, random shakes and fast heart beating, random rash, joint pains, diarrhea, and when i do poop i feel like it's the biggest one ever and it won't be.. and i'll still feel like i have to poop again. so please help.