I had a bit different radiation location as my cancer was in my ear but still had mouth ulceration, pain, and change of taste. I had chemo during radiation as well and it was 3 months before I started to develop an appetite. I was still very tired but not as constantly exhausted as before. Your body has a lot of healing to do from all the radiation damage and it takes a while. Probably different for everyone. I hope you are working with the radiation oncologist to deal with his symptoms.

Hello. Sorry your husband is still suffering the side effects. I was told it takes a month for each week of treatment to recover - so 6 - 7 months.
Should be some improvement by now - or soon - so it would be a good idea to talk to the doctors about the continuing sickness.
My treatment was mainly surgery with radiation a mop up exercise so I believe I was not hit with the full force and had no chemo. Even so, that first year afterwards was a quiet year.

I’ve had radiation 3 times and that was always the most difficult part. I had this end date in mind once radiation ended, but @alpaca is right- about a month to heal from each week of radiation. That first month or two after my course of radiation was always the most difficult during all treatment.

It seems like he is having trouble sleeping. Is it due to pain?

I have thought about your post for several days. I am a year out from my treatment. Following surgery where they removed cancer from base of my tongue and removed 42 lymph nodes from the right side of my neck, I underwent 6 weeks of radiation and 6 chemotherapy treatments. I was hospitalized many times during treatment, I lost over 50 pounds and have only gained back about 5 lbs. I could not eat solid foods for 6 months, and I am currently eating enough to sustain my health. I had to receive IV hydration every other day for 4 months after my last treatment. I had no desire to eat or drink, no did I want to. My family tried to support me but they just thought I could pick up a spoon and start eating again. My energy levels were very low and I tired easily.. I did maintain a somewhat normal active life, but I haven't exercised or gotten back to my walking 8 miles a day. I tell people the most difficult part of cancer is recovery!! Please be patient with your husband, the road to recovery is long and difficult.. But a year out from now he will be a new stronger person. Please be kind and gentle with him, and also remember to be kind and gentle to yourself.. Good Luck..