In the winter, I spend more time with sinus infections than without. I feel like I've tried everything, but relief is temporary at best.
edit: Thanks for the tips everyone. Upvotes all around! Some of these suggestions I've tried, others are new to me. I'm going to give them all a shot. Looking forward to breathing again!
I use a neti pot or saline spay often durning the spring and fall. For last few years flonaze has helped a lot too. An air filter and staying away from smoke helps too.
Do you have a house? Do you regularly change your furnace filters? Is your house over 10 years old and had the ducts cleaned?
I know a guy that would get sinus infections yearly and had his ducts cleaned, problem went away. He was rather extreme and does it yearly, but it works for him and spending a few hundred a year is worth it to not have sinus problems every year.
What helped me was to eat better. In general my health improved by getting further away from a SAD (Standard American Diet): no meat, only occasional fish, lots of vegetables, much fewer processed foods. But what might be the most important was to replace sugar with local and/or unfiltered honey. (Maybe its pollen immunized me from certain allergies that started the infections?) I haven't had a sinus infection for months, almost years now.