Dawn,
Please have your father check into a PEG tube. I would never have made it without one. After 3 weeks of radiation I went 7 months without eating, my tongue and throat were so swollen that I could swallow only small sips of water. I can now eat solid food but it takes a long time to eat a small amount but it's real food. My tongue is still very sensitive to spicy foods. With a PEG tube and 9 cans of Ensuer Plus a day I was able to put on 15 pounds.