I know how hard it is to push yourself to take in enough. Every single day until you hot the first year post rads, by taking in at least 2500 calories and 48-64 oz of water you will do better. After going thru so much your body will have to rebuild itself. Normal calories arent enough. I see where your doc is coming from but by continuing to push to hit the 2500 calories daily, it will only help you get better faster. Please do the best you can to maintain this pace with your intake.

Alot of eating right now is about the texture of the foods. Try canned sliced peaches. The syrup helps them to slide right down. I also was a fan of cold chocolate milk (400 calories/pint) to help soothe my sore throat.

Easy to Eat Foods list