I was told that the immediate side effects (fatigue, bowels, bladder, blood in urine, mucus farts etc) would get worse over the next 2 weeks (and they did!) then improve over the following 8 - 10 weeks (they did). But I had to wait almost 7 months for a PSA test, because I was told the radiotherapy 'messes up your insides' badly, and it takes that long for them to settle down and heal enough to give a reliable PSA level. Side effects of the hormone therapy, if you had it, take much, much longer. I was told it can take a year or more before they wear off. I had my last 3-month hormone injection last September, and the side effects are still with me. Not much you can do in any case - just bear with it.
Hermit.