@ernierogersquamus123 I agree that there has to be a better road to recovery. OTC meds help but they can damage the kidneys when taken long term. I know from experience with a relative that this does happen.
You can address one thing at a time. Raw throat for example can often be relieved by a warm salt water gargle twice a day. Some add baking soda to that mix. Taste is not pleasant but it does help most people.
Neck pain can be exercised out in many cases. I stretched my jaw for mouth opening daily for two months to get that back to normal.
Doctors simply don’t have experience with side effects of radiation. Your symptoms are often baffling to a doctor. You might need to pry a little, encourage your PC to experiment a little. Pills usually won’t do much for repair or recovery other than to temporarily relieve pain or infection. Time and exercise seem to be the best medicine.