Welcome to the best club nobody wants to join. I'm no doctor, but my guess is the trifecta surgery, rads, with chemo. All three can be brutal on the body, the good news, being
HPV pos means you have a good chance of kicking this in the but.
However the next 4-5 months are no picnic. Go a head and tell the boys your situation. I told mine. Hopefully your boys can help out around the house, yard, garage. I was so weak when I was deep in treatment, that taking out the garbage was an event. Get as much of this stuff done now.
Hopefully next year you will be able to look back on it as just a rough summer and that's all. Mine was just a rough winter.
Good luck and post often. It really helps you and everyone else on the boards.