Had a check-up this week. The verdict is that I'm not well, but I am better. I will be continuing the nasal steroids and antibiotic washes, and then going back for another check-up next month. I'll also be starting allergy shots (joy).
In other somewhat freaky put possibly good news, I'm also going to be checked to see if there might be an auto-immune condition that is making this more of an uphill climb than it should be. I've been on medicine for something called Hashimoto's thyroiditis for twelve years now -- that's when your immune system attacks the thyroid gland. (I imagine my immune system as a bunch of extremely dedicated but keyed up and stressed-out soldiers who think everything is Godzilla. It's a vision that explains my allergies and joint problems, too.) My family has a history of auto-immune whackiness, so it seems reasonable to check.
Thanks to everyone for your well-wishes and patience! <3