I had prolapse but no pain other than rectal irritation and incomplete emptying. Please see some of my suggestions to people in other areas of this forum as well. I’m wondering where your pain might be. Is it burning and itching or bending over cramps? I can tell you that if it is pouch irritation rectal burn use Calmoseptine cream on clean skin. Take warm water enemas (get rid of what’s in them and fill with warm water) insert while sitting on toilet to help flush irritants and help help empty pouch. I cant see where biofeedback would work. My guess is it’s part of the prolapse issue and needs addressed by a DIFFERENT gastroenterologist. Stick to GI surgeons or Those that specialize in the condition. Never heard Biofeedback mentioned in all my 20 years. They may suggest you having a follow up sigmoid or defacography to really be able to see what’s causing the pain.