The under statement of the year, "Radiation sucks". No question about it. Calorie intake is the biggest challenge. Just focus on getting thru the next feeding. Keep drinking orally everyday. Even if it is just a few sips. Watch out for burning tongue, for me thrush followed, with all its nasty effects. I think it might be worth preemtive actions, if there are any. Aasks the doc to look every time you see one. It sucks but its just pain. You will get thru it. Good luck.