Over a week ago I started feeling nauseous. Then I started to vomit. The vomiting is slowing down but today I noticed a sharp pain in my upper stomach area and a really sore back. I'm at the er right now but I'm wondering what you guys think it may be. At first I thought it was a stomach flu but now I'm not sure. Other things that I've had been having are hot flashes and migranes. I've been told by my parents it could be something up with my gallbladder