Oh, cool. I guess I should stop
I'm severely allergic to dust mites as well. I get weekly allergy shots and while they've had a great effect on itchy eyes, runny nose, extreme stuffiness, and other seasonal allergy symptoms... my nose is still congested almost all the time.
I got a dust mite-proof cover for my mattress, tried vacuuming + cleaning more. No improvement.
I got two different nasal procedures to open my airways. First a turbinate reduction - no benefit. Later "vivair" or something... it was non-surgical, basically "radio" treatment or something. I don't think it makes sense that it was radio waves that burned my flesh since, y'know, that's not how radio waves work. Maybe microwaves or something, but the nurses and doctor couldn't explain it. As you can see, I was desperate enough to try it. Anyway - it didn't help. My nose is still clogged almost all the time. YMMV