I had 32 sessions of RT in 2016, I was also on , for 3 yrs with abiraterone,enzalutimide,prednisolone for 2 yrs on trial so any tiredness/fatigue etc may be more due to HT rather than RT. However I'm sure I did get a bit more tired/fatigued as RT progressed but not too bad, nothing compared to HT anyway. Bladder urgency did increase and had few issues with bowel control as treatment progressed and after it finished for a while. Soiled myself 3 times whilst out which obv not great, despite emptying bowel before went out. These were sort of expected though. My RT was at clatterbridge, thankfully less than 10mins from home, the policy there was mini enema upon arrival and when staff knew you were up shortly told to drink 3 cups water.
When I was out for the day etc whilst still having 'effects' i'd take imodium which worked well. I was advised not to change diet too much at all other than try avoid beans, sprouts etc things that produce wind, they want things to stay same as possible.
Peter