I just started using ketoconazole spray for candida in the sinuses. It was made by a compounding pharmacy where I live through a prescription from my Nurse Practitioner. The clerk at the pharmacy said she used it for chronic sinus infections and it really worked. I have tried everything. I have had this problem which has caused chronic headaches for 40 years. We will see if this works! I have high hopes. Thanks for the advice about the Vitamin C