Good morning, @cris2. There are some over the counter products that can help greatly with dry mouth. Chemo and some meds can have a side effect of reducing saliva. I know your husband has to be cautious with what he does put in his mouth because it’s so sore. There are two products I’ve used in the past that are gentle and really helped. Check out any of the Biotene products. Also, Xylomelts by Oracoat.
My go-to nasal spray that keeps my sinuses happy is Xlear, another product with xylitol. That really helps with the breathing at night by keeping the tissue moist.

Your idea of a humidifier is excellent. That may help your husband breathe a little easier. Vicks makes some nice room humidifiers. They’re small, table-top size and easy to clean.

You’re both going through a challenging time right now. It’s not easy when your lives get turned upside down with an expected illness. My husband and I went through the same thing and it really just pulls the rug right out from under you! It’s tough on both the patient and the caregiver. But hang in there and don’t lose hope, because things will get better!

I know your husband's on a little break from chemo. Have you heard if he’ll be able to continue with the radiation schedule?