Doreen,
I agree with Danny G., small steps. Take walks, work on any project that allows him to feel useful at home, volunteer at something that helps less fortunate people (to have him around people that need his help will boost his morale), If you are active with a church he could visit other hospitalized members. It takes time to train the mind to think in positives not to dwell in the negatives

Mark, 21 Year survivor, SCC right tonsil, 3 nodes positive, one with extra-capsular spread. I never asked what stage (would have scared me anyway) Right side tonsillectomy, radical neck dissection right side, maximum radiation to both sides, no chemo, no PEG, age 40 when diagnosed.