Sorry you both are having to deal with this.

Was his cancer tested for the presence of HPV?

Where did it come back?

Where is he being treated?

I assume the chemo is Cisplatin? If so watch out for "ringing in his ears". If he starts to hear ANYTHING strange or different especially after the 2nd bag, tell his docs immediately. You may even want to ask for a hearing test now to establish a baseline just in case.

Find a recent blood test and record his TSH level and keep that for future reference if needed.

Do get him to consume a ton of calories and water each and every day from now until well past his first year of recovery.

He will lose his taste, if he already hasn't.

His worse time will most likely occur starting around the 4th week of Tx and continue thru his 3rd week after Tx ends with the worst of that coming after Tx ends.

I only mention this because it's common among us and I don't want either of you to think this is abnormal. We can all react differently so hope for the best.

This site will be invaluable during this Tx and beyond so please keep posting and reading. You as the Caregiver, which is not a nice job to land, will be constantly tested and you may have to become the nurse from hell from time to time and he will most likely NOT appreciate it until after his treatment is weeks past so just be prepared.