I've read all the responses, thanks. I'll check into all of the following (since I'm still getting over this):
*Expectorants *Nose sprays and "neti-pots" (the latter sounds like a good time ;-)
*Use of window fans *DCs
*Ambient Air Cleaners *Alternative masks mentioned
I think I did manage to figure out 90% of my problem, though: Somehow, I had it in my head that the green masks were more protective and the white masks were less (I have both types in my garage). I had been using the green, until I was at the borg over the weekend, eyeing the "gas masks," and noticed something about the regular masks: The white ones were thick and had the two straps and the greens were for light duty. Ack, I had been using the greens! I've switched to the whites, and have been breathing no dust since, though these do still fog my glasses/goggles. Because of that, I'll probably go with a mask with cartridges, etc.
I'll probably have to rig up some kind of DC or Air Cleaner, too, since I don't want to have to wear a mask everytime I go in the garage (that router powder hangs in the air for a while, and stirs up easily).
Darn, I guess that also means that I've got to get a router with an integral DC port, or else I've got to rout outside (daylight only).
Thanks again, Jamie