I am 2 years post radiation and had most of the problems you listed at first and saw a lot of improvement by end of first year. Mouth sore went away but dry mouth continued. Toothaches went away. Dry mouth still present but improving slowly. I have to drink more water when I eat and avoid overly chewy things for best swallowing. I have my teeth cleaned more often which helps.
Also minimal interest in sweets. My sense of taste is varied day to day. Probably about 60%. It will get better in time and like another writer said
all of these side effects are the price of survival and still being able to enjoy what we can. Wishing you the best-things will improve.