I was still paraplegic right after I finished radiation, so my experiences were atypical, but my recommendation for recovery is lots of moderation. 🙂

DO keep active with moderate exercise (even just raking leaves or walking to the store is a good start).

DO eat normal, healthy meals.

DO take a 20-min power nap in the afternoon if you feel like one.

DON'T drive yourself to do extreme exercise. Silence your inner drill sergeant. Right now, pain means *no* gain.

DON'T eat excessively large, fried fatty meals (except as sometimes treats): digesting those takes a surprising amount of energy, and you don't have that energy to spare right now.

DON'T worry that you'll always feel like this. Your body is busy healing the collateral radiation damage, so it's drawing a lot of your energy budget right now, but it's only temporary.

Best of luck!