I have allergy and chronic sinus problems too, ever since I was a kid. it used to be severe when a lot of pollen was in the air. One year I went on a raw foods kick, and ate nothing but raw foods and water for a couple months. Mt allergies got significantly better and have been ever since. I used to go through a lot of sudafed type drugs every spring. Now I might take one every couple years, usually none at all. i can't say for sure if the raw foods did it, but it seems like it. Other little pains went away too.
I do believe meditation helps also. When we say "purifying the nervous system", I truly believe there are impurities we are driving out, even though they may be largely energetic.