Anyone who has dust/mold allergies: Do you ever get nasal congestion at the back, where your nasal passages meet your throat?

Mine has been worsening for a few months, where it now affects my swallowing. When I find something sarcastic funny, I can barely snort at it anymore. And when I read books with my son that include making gulping sounds, mine aren't normal anymore. I also feel like I have to swallow constantly.

I had a clear head MRI at Christmas, and a clear X-ray this morning. Several years ago I developed an allergy to dust/mold (told to me byy allergist), and I've had nasal congestion and eustachian tube congestion ever since. I suspect that my dust allergy has gotten much worse in our new house, where we've been for just over a year. It has carpet, whereas our last home didn't. And since I have chronic fatigue, I'm barely able to vacuum.

My theory makes sense logically, but is it possible for nasal congestion and inflammation from a dust allergy to affect the upper throat?