Based on my personal experience with candida in sinuses, one of three things should help you: Sovereign Silver nasal spray (sold at Vitamin Shoppe), XClear nasal spray (contains xylitol), and homemade probiotic nasal spray made by putting part of a Nature's Way Acidophilus Bifid capsule into an empty nasal spray bottle with some distilled water.
Using a neti pot with a drop or two of tea tree oil added won't hurt either.
All of the above have helped me, but I have to say that the probiotic nasal spray has made the most difference thus far. While my sinuses are not yet cured, they are definitely under control and bother me far, far less than they did before.