I've had bad sinus infections for a year & 1/2 (rounds of antobiotics in the teens). If there wasn't a fungus problem before, there is now. I stumbled onto Miracle-Mineral-Supplement when someone suggested it. So far it is the only thing that has helped. It's been over a month and I'm still spitting out white foam post-nasal drop onto plates which are scattered all over the house. My husband is sooooooo grossed out! The white foam I'm thinking is yeast. Plus I have folliculits from pitysrosporum ovale - a type of yeast.
I'd give the Miracle-Mineral-Supplement a try. It's only about $20 for a large supply. Do not irrigate it into your sinuses though!