Fam hx of stomach cancers, ulcers, gallstones). I'm 50, gallbladder out 20 yrs ago, 2 ulcers. Now dx with IBS. Taking natural supplements. Any advice?

Stay with GI doc. You really need to maintain a strong, active rapport with your Gastroenterologist. You are at an age at which monitoring is essential, especially with a new IBS diagnosis. You need regular colonoscopy and EGD at least. For new IBS diagnosis, consider ultrasound, MRCP, CT and testing for gluten sensitivity.