the tests you mentioned have been performed-negative. The conditions ruled out to be-negatives..A CT-scan with contrast done also. Having a bowel movement makes me feel nausea. When food of water hit my stomach it makes me nausea. The Dr.s are performing more test next week.
have they done a barium enema or even a colonoscopy? where exactly on the lower stomach is your pain?
I had a horrible lower left pain in my stomach and it turned out to be diverticulitis. My husband had a pain on his lower right and it was his appendix. Both where diagnosed with ct scan of the abdomen and the ct was done with contrast.
also the final thing I can think of it IBS. But usually IBS gets some relif after having a bowel movement.