Hello @bdmadisonga. I think you should be looking for a second opinion, not relying on a single radiologist for a diagnosis. We all make mistakes and radiology is an inexact science at best. We ran into radiologist error in misdiagnosing my husband's bladder cancer. Same scan revealed it to a radiologist at Mayo Clinic.
I also have dry mouth from my cancer surgery. The Xylimelt tablets are a huge help at night. They stick to your gum and slowly release Xylitol to stimulate saliva production. Just maintaining good hydration throughout the day is so important too. And try a cool mist ultrasonic vaporizer beside your bed at night.
Can you request an ENT referral from your PCP?