Hi, It sounds like your dad and my mom are having similar treatments. Mom has had 3 Cisplatins (the last was last Wed.) and she has 2 more radiation treatments this week and she will be DONE!! (She had 36 in all, I think.) Anyway, she too is quite exhausted. Her worst side effect right now is actually the constant thick mucousy saliva production. Is your dad having this also?
Mom has a PEG tube and has been doing very well holding her weight. Her neck did get very reddened and has now kind of peeled, but it has remained O.K. I think she is using aloe at home after the rad. treatments to keep it lubricated.
We are so glad to be close to the end, but from what I understand it takes several weeks to really start recovering. Hang in there and give lots of encouragement. I know my mom likes to hear that others are having similar problems, so she knows that they are "normal" for this treatment.

Good luck and God bless you!
Marie's daughter