Uncontrollable vomiting right after eating

Hi. I'm an 18 year old female. Right after I eat, I vomit. It's usually 5-15 minutes after eating or drinking. Anything I eat or drink, I vomit- even water and sometimes my medications. I don't necessarily vomit 100% of my food, but it's a lot of it. I do have idiopathic gastroparesis, however, I don't pose all the symptoms that comes with it. I don't feel nauseous; I feel the food coming up and, I just vomit, and I if I do hold it in, I feel a bit nauseous. I don’t experience early satiety either. Also, my gallbladder is only functioning at 24% and I have gallstones. Most of the time my upper abdomen burns and hurts a lot, and sometimes my upper right side will cramp and hurt as well. Recently, I had an h. pylori infection (2nd time). The first time (back in April 2012) I had it the treatment worked. But about 2 and a half weeks ago when I got it, the treatment did not work at all. I'm going to see a doctor soon, but I would like to know what causes my incessant vomiting beforehand and would like a better understanding of this. I have a few conditions of what it might be, but I’m not entirely too sure.