If all is well, so far, the weeks after treatment may not be as bad as is for some. Usually it's the time when the rope mucus sets in, then the dry mouth, skin burns are at its worst. Radiation keeps working several weeks after the completion of treatment. Don't expect side effects to suddenly stop at the two week mark, it slowly gets better. Most significant improvements, in my experience, are at 3 months, 6 months, 1 year. Maybe because historically is when I see my doctors, have scans and have to think about it more. Side effects can take years to resolve, some never, and then long term effects can set in. I don't ever think it's a distant memory, but life goes on, the worst may be behind him, and is often individualized, just like treatment.

Good luck.