Have you had other tests done, like colonoscopy, sbft, etc? If so, how long has it been? I'm not a dr and have no medical background so take what I say with a grain of salt but if I were in your shoes I would at least ask my GI/Dr. if it's possible I could have a bowel obstruction? It could be IBS or something else but whatever it is, if it's bothering you and if there's even the slightest chance it could be a bowel obstruction it's worth having checked out. Thats just my .02 worth.