Sinus infections can be fungal. I would wonder about this in your case. For sure cut out Sugar from your diet. Do you have a good allergist or doc who would be willing to do a culture? I have gone to mine and said I didn't want any drugs until we see what the culture grows (it takes about 2-3days). Also, my allergist will actually look at stuff under the microscope in her office and can tell if there is a lot of bacteria or just inflamation cells etc. What area are you in?