Long-term radiation damage to bowels?

I’m looking for information on late-effects of cancer treatment, particularly to the bowels. I have had radiation to my whole abdomen and chest, as well as abdominal surgery and 4 chemotherapy drugs. I am having a lot of bowel issues 15 years later and having trouble finding relevant information. I meet with my gastroenterologist soon but he’s running more tests. He says surgery is really the only option to treat scar tissue but if I could avoid removing part of my bowel that would be awesome… I’m quite young. Any good websites or medical journals I could read into?