Yes, I had bowel and bladder side effects (SEs) during and for a couple of weeks after Salvage Radiation. So did a friend being tx'd at the same time.
Good news: 2 - 4 wks after radiation therapy ended, SEs disappeared.
Reality: Different degrees of urinary urgency, diarrhea and pain common.
I had full blown Radiation Proctitis, and mine was extremely bad. My friend's was not as severe.
Not a lot available to manage the pain.
Good luck. I hope it does not get worse, but it may.
Note: Layperson understanding.