I know family members and friends who have had great success with the natural remedies already suggested.
If you already have a sinus infection going that does not seem to clear up, or clears up for a short time and then comes right back, you might have chronic sinusitis.
I had that years ago and finally went to an ENT who put me on a broad spectrum antibiotic for about a month and also allergy medicine. I don't think I've had a sinus infection since.
Just wanted to put out there that you might need some medical intervention in addition to the natural remedies. Once you get it knocked out, the neti pot can definitely help keep you from getting another one.
good luck!
Grits
2010 Trek 5.2 Madone WSD, SI Diva Gel Flow
2002 Terry Classic, Terry Liberator