Sino may chronic sinus allergy dito?

I developed an allergy around 8 years ago when I was in my former office. When we were about to transfer to another building, old documents have to disposed. That was the start - and unfortunately the end is not near hehehe.

I lived in Japan for two years and survived with minimal allergy because wearing mask is very accepted there.
But here, even though I dont mind receiving weird looks, I cannot consistently wear mask. And living near a forested area, complicated the matter.

I regularly have nasal wash (using Flo-sinus) and take anti-histamine.

Any suggested remedy? Someone mentioned essential oils but the starter kit if very expensive (like US$300).