JH , salvage RT resulted in severe radiation cystitis to my bladder. By the time it was diagnosed my bladder was beyond help. Make sure you are being looked after by someone who understands radiation damage. My symptoms were passing lots and blood clots,debris , tissue and some blood.
I tried some sessions of hyperbaric oxygen treatment but it was too late for me. There is a charity called the pelvic radiation disease association, they recommend a couple of consultants to see.