I had my J pouch surgery in 1988 - yes I am old . For many years I had no problems. In about 2008 things went down hill slowly. BM frequency increased, and as a result I had severe burning around my anus. I was told to try Colestyramine sold as Questran Lite powder. My problem - may be yours? - was the acids produced in the gut/digestive tract are no longer absorbed/diluted because of the removal of large intestine. The Questran (somehow) neutralises/prevents this acid reaching the anus and burning as it gets out.
Also Questran lowers you cholesterol .