Christine is absolutely right about him not feeling very good right now. None of us did right after radiation treatments ended. In fact the worst time for me were the two weeks after radiation. I had managed to eat food during treatment which not everyone does, although it was getting hard the last week and a half. But afterwards--way worse, mouth sores were the worst. He may feel worse in a few days than what he does now. That would be the normal course of events.

A year later, I am eating food and enjoying it. Not like before, but most of it tastes much better. I am hopeful that it will be better yet. My doctor says yes it will (again just as Christine wrote)that they see improvements in areas such as taste much later than this. To one accustomed to good health (that would have been me prior to all this) it is difficult to imagine that it would take so long to recover but it sure does.
I hope that knowing this will help you and your husband feel better about where he is now in recovery.

Best,
Anne