Radiation does not cause the dramatic drop in PSA that surgical removal does. I was lucky with my radiation treatment, only problems in the first few days then went back to normal diet. I do get up at night a couple of more times though for a trip to the head. My radiation ended June, I still have very loose watery bowl movements. Radiation's effect is not complete the day radiation ends.
Radiation effects can hang on for several months post radiation.
Tried the cortisone enemas and unfortunately they haven't helped. I used it a lot during radiation and afterward I try to avoid it now. Night, I don't know if it has long lasting effects, but it is best not used if not needed. Metamucil is often effective for watery stools because it absorbs the fluid. I saw a clinic on the net that's doing heat probe to seal off bleeders with good success.