Hi @pampou,
I had 35 rounds (7weeks) of Photon radiation for a total of 70Gy and 3 rounds of cisplatin chemo for tonsil cancer back in 2008 but no surgery and to help with the brutal dry mouth tried ELECTRICAL STIMULATION ACUPUNCTURE in 2015 which was offered at my cancer clinic for head & neck cancer patients. I was tested to get a baseline and retested after 8-10 appts. and had great results. Never needed to go back and to this day 10 yrs. later dry mouth is a non-issue and I don't have to carry a water bottle with me either. I also slept with a bottle of water next to me and got a Humidifier on my end table to make sure there was the most moisture possible in my bedroom to help get some sleep. Hope you will get better.