Lottie,
Good point about the lack of a physician in charge of post treatment issues. GPs are in no position to deal with the complicated issues.

When my husband had his last appointment with his ENT and Radiation Oncologist (I think it was at 2 years out from treatment) I asked them if there was anything to be aware of as time went on. The RO said the only thing was an increased incidence of lymphoma at 10 years out from treatment. That's it.