What natural cures are there for my irritable bowel?

I am 65 years old and about ten years ago, after radio and chemia therapy, I was operated on for rectal carcinoma, with removal of 22 cm. of bowels, and consequent coloanal packaging, which avoided my stoma Miles. Unfortunately, in all these years I have not been able to reduce the frequent episodes of diarrhea that often affects me, especially if I eat irritating foods. Is there any remedy or drug that could prevent me from the episodes of diarrhea , bloating and flatulence , which create great embarrassment for me? Thank you