Hi Brad, I use oil of oregano to flush out my sinuses.
Do you have the drops of the pill form? For thrush, you can take it orally and use it as a mouthwash to kill the yeast in the mouth.
Another good herb for killing yeast is Olive Leaf extract in pill form.
I never had thrush, but did rid my tongue of yeast, I was doing something called oil pulling. That's where you take sunflower oil and swish it around your mouth for 15 mins 2 x a day. It worked wonders for me.
What abx are you on and are you taking a good quality probiotic?
The world breaks every one and afterward many are strong in the broken places