Well, i was diagnosed with sinusitis about 6 years ago...
Something i use on a daily basis is a home remedy i got from Dr. Weil's webpage
http://www.drweil.com/u/Home/index.html
I use about 1 cup lukewarm tap water with about half table spoon of salt (like the kind you use for cooking, normal table salt) I rise with it by cupping my hands and sucking it through my nose etc. I usually get about 3-4 rinses for each cup of water/salt mixture. It helps me quite a bit ... give that a whirl when you don't feel like using the rinse anymore
sweetpea