I'm 14 yr old girl and in varsity basketball. We practice everyday in my last block but I haven't been practicing for a week because my upper ribs burns like crazy! It last for about 2 hrs everyday. With the burning pain, I have pinching feelings on my arms, especially in my elbow and wrist. Last night I woke up in my sleep with burning pain and been vomiting for hours with a dark brown color. I went to the doctor for this and he said that it is probably heartburn but didn't run any test. And also Ive found a large fatty lump on my upper ribs below my left breast. I've have been feeling very weak as well. Also one week ago I was 136lbs and now I weigh 125lbs...no physical activity, sometimes I don't eat because of the burning pain. Is it a stomach ulcer? What going on? Please help!