It sounds like you have a direct iloeoanal anastamosis. J-pouches generally work much, much better than those. Heck, it sounds like you've been having the equivalent of pouchitis symptoms for a long time. For most J-pouchers pouchitis is an occasional, easily treated nuisance. If all goes as it usually does surgically, the only negative will be your regret for having waited so long. Life has few guarantees, of course.
Why not talk to a recommended colorectal surgeon and get at least some of your answers with higher certainty?