Have you tried pelvic floor PT after the surgery? It might help. It takes time to find which exercises will work for you, but once you do, you can create a solid plan to rebuild the structures that were damaged.

I had reoccurring intussusception, complete rectal prolapse, ulcers in my sigmoid, torturous/redundant colon, and stool blockage that so far has required 3 surgeries. I had my second ostomy revision 4 months ago and stool absolutely will not reach my bag, so I'm stuck irrigating until we call figure out why it's still not working, but in the interim, I've been going to pelvic floor pt to help release some very tight ligaments and muscles and rebuild what's left of my poor pelvic floor. I have EDS so I'm beyond flexible ethic can make PT a challenge of you don't have the right therapist. If you do PT just make sure that your therapist understands all of your conditions and has experience or at least solid knowledge about them, otherwise your sessions could be ineffective. I went through 15 years of ineffective PT because they knew nothing about ppl with EDS at that time.

Be careful with M.O.M and miralax. They can both lead to awful electrolyte imbalance. I've been hospitalized for it twice. If you feel foggy headed, or more neuropathy than usual, headaches, vision changes, dizziness, irritability, or just feel a bit "off," You may need to up your intake of electrolytes. I use a product called Saltt, and so far I've avoided anymore trips to the hospital. It got so bad that my arms and face were paralyzed. I'd love for no one else to suffer from this if it's avoidable, so I preach hydration.

Apologies, if you've already tried any of my recommendations 🙂
I hope you have an amazing recovery!