As someone who's lived with chronic, recurrent sinusitis for over a decade, maybe two decades, I just want to emphasize a few points.

It is NOT necessary or good to put so much alkalol or salt in the irrigation water that it hurts. Just as much alkalol as you're comfortable with. Something less than a teaspoon of peroxide. And the salt solution works best if you use kosher salt and baking soda, if you make your own, according to recipes given on the sinus sites, OR, use Breathease, which is pre-made and non-irritating.

I've not found a single ENT who would not encourage irrigation while infected, and it certainly makes one more comfortable.

But keep everything clean, and use distilled water preferably.

Antibiotics should be matched to the organism, and they can vary, so what works for one might not for another.

Good luck with this one...