I waited until after surgery to join this forum, too. Sorry you are here, but we're all glad to help.
I had a lot of pain when urinating after the catheter removal. It lasted for about 4 weeks. My doc was not concerned. It has cleared up now for a while at 8 weeks post op. If your pain concerns you be sure to call your doc. I had the pain in the butt too but I'm not sure if it is the same as yours. That has mostly cleared up now, too. Mostly, it is about waiting and getting better a little bit at a time.
Also, if you could post a signature, that would be helpful. Click on control panel after you log in.