With radiation I had just a bit of diarrhea, maybe once or twice during treatment. I had a couple of bowel issues maybe a month after but that's it. My primary side effect was tiredness.
Lupron was another story . Ugh.
My six month injection 'ended' along with radiation therapy end of 2015. By March 2016 my T returned and along with the T a bunch of energy but I was still suffering from the usual SEs.
It took months and months, maybe a full year before I felt like my old self.