It is very normal to feel fatigued after radiation. Think of it as if you were in the hot sun at the beach. It is important to rest when the body is telling you to rest and to hydrate.
How can I improve my lifestyle to better manage chronic pain?
As a chronically ill patient myself, the best way I manage the pain is with remaining active, ice and heat applied to the painful areas, and maintaining communication with my doctors to reduce my symptoms.