I never had accupunture for Xerostomia or Lymphdemia, but I did have it 14 years ago for severe sciatica due to a herniated disc recurrence, and was out of work for a month, and bed ridden. I tried everything, chiropractic, physical therapy, pain meds, anti-inflammatory, cortisone, moist heat, etc. and nothing worked. Finally I went to a Chinese acupuncturist doctor practicing here, had to pay out of pocket, and had some relief that night for the first time in a month, and slept very well. The acupuncturist told me when I got home I would urinate the toxins out, and go to sleep, which is what happened. In 4 weeks I had no pain, no meds, could walk normally, and returned to work with no low back problems since. What I was told it reduces inflammation, and cuts off the pain signal (switch) to the brain.
I would try accupuncture one day for H&N, but would speak with my conventional physicians first being so much was done there.