Deborah,

My father has been saying the same thing but Monday he went to his ENT for the 6 week check and the ENT did a good job of explaining cancer cells in simple terms or maybe for once my father just decided to listen to him. Whatever the case it bought us at least another week of getting him to continue radiation. He told my father that cancer cells have four stages and radiation treats these cells at stage 3 if you skip a week or quit early these cells may have time to go to stage 4 and will not be killed by the radiation because they were able to have time to make it to stage 4. It might be worth a shot - I know it is hard but I also agree with Steve try different or more pain meds and as I keep telling my father - it won't last forever there is an end to the treatments and it will eventually get better.
Hang in there!