We visited the allergist this morning, and ended up having some tests done to see if allergies are contributing to Monkey's chronic sinus ick. Yep, it is. Turns out he's probably allergic to cats(!) and borderline for dust mites. Fortunately, the doctor said that there is a very high margin of error in the scratch tests (50%), and where Monkey's not breaking out into sneezing fits when he plays with the cat (Only Anya will play. Rena doesn't do that sort of thing.) the doctor said it would probably be premature to say that we should get rid of our cats at this point. Though we should discourage them from sleeping in his bed. The dust mites should be pretty straight forward to deal with: weekly hot water washes for the bedding and cool dust mite covers for the mattresses and pillows.
It's nice to have some new ideas about what to do for the never ending nose icks. Really nice. But my strongest feeling right now is relief at not loosing our cats!