As suggested, I would see about a 2nd or 3rd opinion. You may want to look into High Dose Intraopertive Radiadion Therapy (HD-IORT), Brachtherapy, Radiosurgery aka Cyberknife. These are high dose radiation treatments in less time, to specified areas, while certain vital organs or structures are protected. Not all CCC will tell you all the options available or send you elsewhere. I had 5 recurrences. I had positive margins, LVI, PNI, after my 2nd neck dissection, and cancer did return as expected, but in a month. The next treatment I had, for a cure, was a neck dissection, my 3rd, along with HD-IORT during surgery, with a pec flap, so radiation could be done a 3rd time, along with chemoradiation for 5 weeks. In total, I had 130Gy of radiation, and some here about the same or even more. Reirridation is limited to the toxicity level of vital structures, but can be done in ways described above, and this is where the doctors experience, and training comes into play.

Good luck, and hope this helps.