Keep going back to the doctor. A couple of years ago I started having stomach issues, and I kept going to the doctor. They couldn't find anything, yet I KNEW something was wrong. A few weeks later I woke one morning in severe pain in the lower right quadrant of my abdomen. I had to have an emergency appendectomy, and my appendix had already burst and was poisoning me.I was very close to death. Keep going back until someone finds something. You know when your body doesn't feel right. Also, you may want to keep a notebook of your symptoms, especially if you get any new symptoms.