If your only symptom is in your sinuses I don’t think you have yeast overgrowth in my opinion and you should look at alternative treatments to address it. A good naturopath likely can help you clear up your sinuses without forcing you to do the diet, etc.
You don’t need to cut carbs…you need to feed yourself first, the yeast will survive either way and adapt to your diet, strict or not. You just shouldn’t eat certain bad foods…
Oral antifungals do work but you need to take them for a long time. Be sure to come up with a detox plan before attempting the diet and antifungals and probiotics.