Take some olive leaf extract along with. It'll wack fungus super well from the inside while you attack it from the surface. Two pronged approach. :)
I've gotten rid of the fungal sinus infections easily with the olive leaf alone, 3 or so caps every 4 hours, a half day or so after I'm not feeling any symptoms. Be sure to take the caps with a hot beverage or cayenne cap (unless your body doesn't tolerate that very well, usually cuz you're a Pitta in the Ayurveda, East Indian medical system) to make sure the herb gets metabolized, and you'll probably be infection free in a day or two.
If that doesn't work and Antibiotics actually helped, it might be bacteria--in which case use golden seal root in place of the olive leaf, same amount and procedure. If you do use goldenseal root, you'll want to do some probiotics after, since like any Antibiotic type thing, it kills all bacteria, both good and bad.