Congrats on finishing!!!! I know he feels horrible but very very soon things will turn around. Radiation continues to keep working even after tx has ended. In 2 or 3 weeks he should begin to feel a tiny bit better. Then it will be small improvements for the next couple weeks. It can be a frustrating time making progress then taking a couple steps backwards with setbacks.

Keep pushing the nutrition and hydration. Force him to take small sips every single day. If nausea is a problem slow down the feedings and add water. This will help make them easier to tolerate. This is why the feeding pump becomes such a great tool. Can add water to the bag of formula and regulate the speed so its able to be kept down.

Hang in there, the light at the end of the tunnel is in sight!