I would agree with the previous post regarding the second opinion unless the PET scan and ENT / Oncology Team already located within a CCC affiliated with a hospital with a demonstrated success treating Head and Neck Cancers.
However, the PET scan results may also result in involvement of additional specialists as well.
If it can be at all helped, this is not something to be treated casually by well meaning, but inexperienced doctors / surgeons.
It may sound a little harsh, but you and your husband have to hit back effectively and HARD.
Good Luck