Have you ever try essential oils. I have terrible sinuses, usually 4-6 infections a year, When my sinusis act up. I take 8-20 thousands miligrms of vit c. and put essentil oils in my candle warmer. and I haven't had infection for 2 yrs, since I've been doing this. haven't gotten sick either, though everyone around me is sick.
I do use some, but what kind are you using? That is a lor of vit c. I should go find mine now. I have been putting peppermint and orange in the humidifiers but I've ordered Breathe Easy, a Three Robbers blend, and think lavender from a friend of mine who is a distributed for this company: http://ancientwisdomessentialoils.com/catalog.asp. I wrote down the list of what I liked and it was crazy amounts of money so I'm going slowly! I just wish I had ordered them a week sooner