Thanks for the suggestion of the kratom. I will do some research to make sure it is compatible with all the other stuff he is using/taking.

Has anyone else used that with good success in addition to David 2?

Spouse of 56 years has had radiation therapy (2004) and surgery and proton therapy (2016) for oral SCC in his tongue. No active tumors presently, but radiation mucositis is causing him severe pain. Affecting eating, talking, quality of life. Dealing with depression. Look for support and tips from those who have been there.