I had a very similar surgery decades ago.
Three weeks later we went on a trip to china, and the dust and pollution were almost unbearable with those newly opened sinus cavities.
One thing that the Dr didn't tell me about but a friend who had similar surgery bought and sent me one is
http://www.ethicare.com/prodinfo.html
Scroll down to #1 AHUN
I have used this same product with first an adapter with a water-pik, then went thru a couple of the ethicare pumps, then another water-pik prior to a current model that I am now using.
IMO, the water-pik and adapter is better than their own pump - because of the pulsing effect of the water-pik.
You put a teaspoon of table salt in the tank of the water-pik and irrigate your sinuses. Have been using this off and on since 1992.
What happened to me, and I understand often happens after similar surgery - the sinuses which were clogged and are now open, start producing a _lot_ of mucous now as they are open and readily available to allergens. That then hardens, clogs up and you are miserable.
If your scenario is anything like mine, there was a good long while there before I got back on track and was glad I had the surgery done.
It's painful, somewhat slow healing, and then an even longer time adapting to the new situation.
You're gonna love being able to smell things, food will taste better, life will be better, you'll slowly start learning to breathe through your nose and only then will you realize how much you had been breathing through your mouth.
Life will be markedly better, but it may take a while getting there.