Hi Tabitha, I have a slightly different view. My recovery after the end of radiation was noticeable within the first week. I lost 30 pounds ending with 155lbs. Yes you should watch out for dehydration. Brian's comment about protein is also important. The body needs a lot of protein to rebuild tissue that was blasted by the radiation. Hang in there, your dad is fortunate to have you looking out for him.

Mark, 21 Year survivor, SCC right tonsil, 3 nodes positive, one with extra-capsular spread. I never asked what stage (would have scared me anyway) Right side tonsillectomy, radical neck dissection right side, maximum radiation to both sides, no chemo, no PEG, age 40 when diagnosed.