Welcome to the group though I am sorry you have to join our circle of friends,

I second Christine's suggestion to get a second opinion at a comprehensive cancer center where the doctors have seen many different cases of cancer and where they use a team approach to treatment.

Do you know how much radiation you father has had -- 12 weeks in all sounds like an awful lot. Opdivo is a new drug and it is a kind of immunotherapy where they try to marshall the body's immune system to fight the cancer. We have a couple of members who are on it/or it has been suggested to them. You can find their posts under the recurrence thread.

Ask your father to carry a spit cup. My husband had one for months and carried it with him everywhere. It was just a disposable plastic cup. Being able to spit helped to keep the amount of phlegm in his mouth to a minimum. The waterpik is very effective for cleaning out dried phlegm and keeping the mouth fresh. If you dad has the magic mouthwash, adding a capful of that to the water helps too. Use the tongue scraper attachment on the lowest setting.