Hi DonnaJean,
Believe it or not, it sounds as if your husband is doing well. He's able to eat solid foods. This is very important for various reasons. One, the function of eating/swallowing will help reduce the chance of scar tissue, strictures, and muscle fibrosis. It also helps to maintain a proper pH balance in the mouth. Of course, nutrition is very, very important. I am 5'10" and 180 pounds. I was consuming 3000 calories/day. If he needs to drink some Ensure to get the calorie count up, then go for it.
The puffy face, particularly in the morning is probably liquid that is having difficulty draining. It usually takes on a poochy or bloated look. This is no problem. It will eventually go away in a few months. I had it and its gone now.
Also, your husband's treatment was in reverse order than mine. He had the radiation first then surgery. As a result, the healing process will probably take a little longer and it's very important to try to keep the neck muscles limber.
Last but not least, I noticed "things" seemed to happen about every three months. Keep the faith and try to have fun.
Hope this helps,
Jeff