Wow, you've got a lot going on here.

I think you are doing a great thing by going with him to treatments. I had several friends of mine drive me the hour it took to get to chemo/radiation and it helped that I had people there to kick me in the ass to go...especially the last week of radiation and my final chemo treatment. I remember sitting on my bed crying, not believing I had the strength to do it anymore. As a former grappler/fighter this was new ground for me.

There is "magic mouthwash" and it does help numb the pain...from the sounds of things the dr's should look at adjusting his pain medication. Being out of pain will raise moral. It is very important to finish out your treatment protocols.

Where is he being treated? What pain meds/dosage is he on? Other medications like compazine will help with nausea...however the more information the Dr's have and the better the communication...the more they can help.

Hang in there

Eric