Scott gave great advice - as always. You are not alone in the lack of sunshine and roses. The first bit after this surgery is kinda rough. My surgeon had the flipping nerve to tell me I would be eating steak straight away! Ha. Not funny, Nope. I was on TPN for 5 weeks because it was an especially complicated surgery, but after that I learned what food worked for me. That's still a work in progress, but soft cooked, pureed or brothy rice is a go to.
The kind nurses gave me "butt burn" cream at the hospital - they knew I would be hurting for a while. I was encouraged to use damp baby wipes to wipe, pretty much anything to be gentle in that area. After the month of TPN, I ate cream of rice, cream of wheat, pureed food, brothy soup, nothing acidic, no beans, no onions, no tomatoes, no orange juice - nothing that would cause more gas or more "burn". Potatoes, rice, scrambled, soft eggs, white toast, super gentle food. Warm herbal tea, lots of water.
It will take a while, but it will get better. Hugs to you.