The best of luck on your upcoming surgery. My gut symptoms along with Covid has kept me close to home. From my experienceI learned that keeping active, even if it's
just in the house really helps. I sat like a dummy for two months and lost valuable healing time.
Stick to the boring diet the give you. It isn't always tasty, but the gut responds well as long as you don't overeat. I have learned it's an experiemental journey. And I took seriously not drinking 30 minutes before and after eating. It means your job is to eat all day according to those parameters. When I went off, I was always hungry, the big D was the result.

It's not a walk in the park, but it does get better. Physical Therapy helped a ;ot and your doctor will put in an order if you choose to take advantage.

I'm 6 months out and stuck at 13 pounds underweight and learning from my every mistake...and I make a lot of them.

It sounds lile you are on the right track. Good luck and best wishes for a comfortable recovery.