Sorry to hear he is having such a hard time. I was fortunate to only have the nausea issue in the last week of chemo and radiation. I was being stubborn and wouldn't let my wife take me to treatment but had to give in during the last week. I also needed iv hydration for a couple weeks after treatments finished and needed to take a month break before going into surgery. I have found asking for help is something we all need to do during treatments and surgery.
Unfortunately with surgery sleeping will be different for the rest of our lives. I sleep on a foam wedge that keeps anything in your stomach instead of coming up into your throat or into your lungs.
I was 60 when diagnosed and am now 63, I to other than being overweight was otherwise healthy before cancer.
With all that being said it's still worth what we go through to beat this terrible disease. Keep fighting and remember when going through this we are stronger together. Don't be afraid to ask for help. Good luck with your surgery.