In my case, @mother42275, I had stage 2 ovarian cancer and was extremely tired after chemo treatments, especially around day 5 and 6. So when I had radiation, I wasn't really tired, just having to go to the hospital 5 days a week was a bit depressing. However, you see some of the same patients, and they're walking in and out of the hospital as if they've just been for a dental hygene visit. It's very normal, after a couple of days, and you generally get the same technicians, and they become your friends. After around 10 radiation sessions, I developed diarrhea, but the technicians know this is quite likely, so they scheduled two sessions with the dietitian for me. The diet really helped.
Anyway, it seems to me that a few months after the radiation was all finished, I had a bit of food poisoning or something, which caused diarrhea, so I had that burning that @ErinB mentioned, so I used Penaten Daily Clear Protection, which they sell in the baby products section of the pharmacy.