Awesome!!! Way to put your foot down. It's only four more weeks of sheer torture for the potential "you're cured" and the opportunity to spend the rest of your life together. Was his cancer HPV + ? You say base of tongue, but based on the surgery he had it sounds more like Oral tongue. If it is HPV+ the cancer responds more readily to chemo and rads... so tell him that. Tell him this is temporary but necessary torture. And while I know he only has two more weeks of treatment, the two weeks after are the worst (do not tell him this!!!!) Then things slowly improve.

take care and god bless.