I grew up in an agricultural area and everyone had respiratory issues from the massive amounts of pesticide and pollen in the area. I was also allergic to house dust mites. It was bad! I remember being unable to breathe through my nose at all for years, having surgery, and completely changing my experience of life. I've recently noticed that i'm having quite a bit of trouble breathing at night, and those old demons are coming back. Your writeup is inspiring me to do a closer investigation as I have been experiencing very similar issues - brainfog, memory loss, all the above.
Your comments is also on point around the shortcomings of OneMedical-style rotating cast of practitioners rather than the longer term relationship with a caregiver.