I have IBS and have bouts of bad pain and other not so pleasant symptoms. Before this diagnosis I had been tested for parasitic infections (was even treated for giardia), colonoscopy/endoscopy, and barium swallow, etc. After everything came back clean I was told by my Doc that it is IBS and am lactose intolerant. Did they test for
celiac disease (normally done during colonoscopy)? Good luck to him and to you...I know you must be so worried! Prayers coming your way!