BIlly, I can tell you that I am more than a year out from surgery, and 10 months out from radiation, and I still need a nap nearly every day by 2 in the afternoon. As much as I hate it, and I really do HATE it, it's part of recovery.

I was a hundred hour a week guy for the past thirty years; now I can do about 30 hours. I'm told that I'm doing well managing that. Your body has been through a HUGE, life threatening ordeal, and it is completely normal...or at least, it's the new normal. Swing with it, it gets better slowly
Wayne