Congrats on finishing your treatments.
Now onto the next phase, recovery! In a short time you should begin to feel a little better. For most patients around the 3rd week after finishing rads is when they first begin to feel somewhat human again.
Keep up the good nutrition and hydration for at least the first year after finishing radiation. A complete recovery takes most patients an entire 2 years. It can be full of ups and downs so try to keep that in mind when you experience setbacks. Its all part of the recovery process which for most of us can never happen quickly enough.
I did find it a bit unusual for your medical staff to say OC is becoming epidemic in men in their 60s-70s. It seems to be more younger
HPV+ patients are being diagnosed than the older patients. But thats what I have seen here on the forum which may or may not be an accurate picture.
Best wishes with your recovery!