Walt

Two months after TX is still rough as Christine mentions.
Not sure what symptoms you have that make you think the cancer is back already and it could just be lingering side effects. Plus a Petscan that soon after base of tongue cancer has a high chance of a false positive which will worry you even more. Since your doctor seems accommodating, consider asking for an MRI instead. Petscans are terrific in spotting lymph node cancer and their increasing use is a major reason for the decrease in unnecessary neck dissections. But BOT cancer patients' mouths suck up as much sugar rebuilding themselves as any remaining cancer cells do and sometimes more, so remember that if you do go with the Petscan that a "bad" one may not be bad at all.
While I did have surgery when my cancer came back, I also did have radiation and chemo. The "no more radiation" doctors are generalizing about no more IMRT radiation, usually because they are not using CyberKnife or similar focused radiation. It's just a candid self assessment of their radiological ability instead of a medical fact . Actually a second dose of radiation is becoming almost standard at CCC, mine is just ahead of the curve with being able to do a third round of radiation.
Bottom line: get yourself evaluated at a CCC where if in fact your cancer has come back, you will have more options of treatment. It is not hopeless although I do agree that it is scary. Hang in there.
Keep the Faith
Charm