I can read your frustrations, and agree with ChristineB, and was in a very similar situation, even while being treated in the nursing home with adequate daily peg feedings by staff, my kidneys almost shut down due to infection, dehydration and almost went on dialysis, creatinine was 6.5, but still had good output, color. My family called 911 due to my feelings, weakness, although resident dr there said I was ok, and wound up in the hospital for 21 days, lost abilty to walk again for the 2nd time, and doctors in hospital again thought they were going to loose me. I have chronic kidney disease now, partly due to this, and creatinine is still high, but leveled off to a steady 2.4. Lack of nutrition and or Dehydration is serious business, and can be deadly.
Completing full treatment without interruption should be taken seriously as trying to cure this disease, not as prevention, and an unknown primary sometimes has a lesser prognosis than other primary cancers, but
HPV helps increase the odds, but still can be deadly. The RO is correct that missing radiation each day amounts to 1 percent for each day, and this is due to the cancer having a chance to repopulate. Actually, the effectiveness of radiation decreases after the first 2-3 weeks, so they use different boosts, fractions, and other techniques to help this, so not missing any more is encouraged.