I have stomach pain, feels like someone hit me in my upper stomach. I walked on the tread mill today for 5 minutes and my stomach really hurts, feel nauseated and then slight chills.I had xrays and found I was constipated. Had sonogram, CT scan, upper GI, Colonoscopy, and am taking Merilax and don't seem to be constipated any longer. I don't even way to eat anything. If I do a lot of bending, walking the pain like I was hit takes over.My family Dr. is scratching his head. The Dr. that did my upper and lower put me on Meds for IBS. What could it be?