Three months post radiation treatment is definitely a short period and of course side effects last for a much longer period in general. Like what Brian has said, I doubt if your dad's doctor is doing the right job. Even though I have never had a PEG tube inserted, my oncologist advised strongly on getting me one when I lost 10 lbs. My experience was not as bad as your dad's as I could still take milk and ice-cream with 'endurable' pain. So no more waiting. Address the eating problem asap!

Karen stage 4 tonsil cancer diagnosed in 9/091.