Hi @bri3sd Welcome to our Head and Neck group.
Swallowing likely will be a challenge for months. My experience is it either gets easier or we just get used to the difficulties.
There are roughly fifty muscles involved with a simple swallow. Many of those muscles were radiated and have stiffness as a result. In addition, likely he suffers from dry mouth, a common occurrence again from being zapped.
Radiation recovery is similar to a serious burn recovery, months if not years, years if not ever. The scars (internal) may never completely go away.
I had to learn how to eat again. And not just how, what. Some foods are off the list as they cannot be easily swallowed. I am the last one finished at the table, small bits, lots of chewing, plenty of liquids to chase.
Your husband can also seek swallowing therapy, yes, it’s a thing. Are there specific foods difficult to swallow?