After RP in Aug 2022, post-op confirmation of G 9 and addition of EPE, my post-op PSA was a "failure" at .19
My salvage radiation treatment (SRT) from Feb - June 2023 consisted of 37 sessions (about 8 weeks ) of IMRT 1.8 gy each (66.6 gy) to the prostate region, with 25 of the sessions including the pelvic lymph nodes (45 my total).
Additionally, 4 mos of ADT.

I had bowel issues, diarrhea and rectal discomfort/pain, particularly over the 2d 4 weeks of treatment.
My post RP continence was really good, for which I am really grateful, and I did not notice any significant change during treatment.

And all radiation SEs resolved w/in 2 - 3 weeks after completion of the radiation portion of my SRT in May.
And at a subsequent unrelated screening colonoscopy, my Gastroenterologist reported that my colon showed no signs of damage, for which I am also very grateful.

ADT was a different story: Primarily fatigue, which mostly resolved about 6 - 8 mos after finishing ADT in June.

Advice: The "mostly empty rectum and mostly full bladder" was a challenge to manage, and different men have had different levels of difficulty, but everyone finds their own way through it.

Personally, I prefer the "low dose, longer term" radiation treatment even though it lengthened the process (some might say "ordeal"). And I traveled over an hour each way, every day, to receive treatment at Johns Hopkins. My choice, although the time and distance exacerbated the challenge.

Payoff has been excellent so far: over 2 yrs of undetectable uPSA tests < .02 and Testosterone has returned to pretreatment baseline ballpark of 439.

Best wishes for successful SRT.