I agree with the above with the 2-3 weeks post treatment being difficult. He should be fine with his wife, even to care for himself, although it can be difficult, one should be somewhat independant.

Also agree with regards to recurrences being dependant on many factors. I don't see HPV, and gather not if it was precancerous 10 years ago. I forget if it was in the oral mouth or orpharyngeal, but surgery is usually the first option with recurrences with or without radiation or chemoradiation. Radiation can be given again, depending in prior dosage in grays, area, toxicity level, proximity to vital structures, and experience of the RO. I had radiation 3x to the same location. Most post treatment scans are clear, although most recurrences occurr the first two years, and will have frequent follow-ups with the oncologists, and ENT for that reason. Usually it's every 1-3 months the first year, and increased a month or so every year thereafter. Ones energy is best served to complete treatment, and recover, instead of the possibility of recurrences, but I think everyone worries after finishing Tx. Good luck.