I am at my wits end.... I have been suffering with nausea/dizziness/weakness since October 2008. I have had tons of testing done (colonoscopy, endoscopy, HIDA scan, small bowel series, CT scan, sonograms) and the only diagnosis has been iron deficiency anemia and acid reflux. I have been treated for the anemia with IV treatments and prescription iron, but continue to be nauseous 4-5 days a week. I also have begun experiencing black tary stools and sharp quick pains in my lower back. I don't know what else can be done from a GI standpoint and wonder what other type of doctor I should see...... I am at a loss and living on 4-6 TUMS a day just to get through. I am young (34) and can't bear the thought of not knowing what is wrong. It is very frustrating.