My stepfather had aggressive throat cancer. He could feel it in his head as well. The cancer was too complex for any surgery so they opted for only high doses of radiation. It was a hard road but he is in complete remission and has been for over a year now. I pray it doesn't come back, but he does not take care of himself the way he should. My mother died shortly after he went into remission for unexpected lung cancer and he just doesn't have the will anymore. Anyway, enough about me. I think your husband has a good fighting chance with this cancer. I understand the pain. My stepfather was in so much pain, for months, I don't know how he could stand it, but he did. When all was said and done, I asked him about the pain, He said the meds numbed him and he wasn't in pain at all.
Take care and best wished to you and your family, Michelle