The funny thing for me was that all the nursing staff and the doctors told me I sailed thru treatment and had the best attitude about it of anyone in the last couple years.
Me: you guys must be dipping into the patients pain killers.
Seriously tho, I had some really bad days, but I drove myself to every treatment except chemo days as they drugged me up pretty hardcore on that day.
I thought being young would give me a serious advantage, did not notice said advantage. I found the very last week of rads thru 4-5 weeks post treatment to be the seriously uncomfortable ones. I was on Hydromorphone at the end, never made it to the fentinal patches. and only took the pain meds after I got home from rads.
But all in all, I think you'll find that you can do it, just communicate well with your docs about pain.