Pamela, sorry you have to come on the roller-coaster ride but a warm welcome nevertheless. Your husband's diagnosis is very similar to my husband's. his Tx was 35 sessions of radiation over seven weeks and three bags of Cisplatin. He only managed two sessions of chemo as he developed deep vein thrombosis after the second session. For the skin, we were advised to used unscented Lubriderm which John put on post treatment from Day 1 ( don't use any immediately before going into treatment as it will intensify the burns). We used flat club soda for rinsing, again from Day 1. I don't know if it was because we did all these things from before the problems started, john never really had problems with mouth sores. He did get some radiation burns and we did the saline soaks diligently, four times a day. The fatigue was overwhelming.
Caregiving can be tiring, so make sure you grab as much rest as you can. It is okay to access counseling support t the hospital if you feel the need. Don't be afraid to ask doctors and nurses questionsif you are unsure about anything. It will help you and your husband through this stressful time.
Hang in there and come on the forum to vent, ask questions or update. You have a circle of friends here who nderstand fully what you are going through.