Turns out the neti pot may have changed my life. I never did make it to a walk-in clinic, but this sinus stuff seems to be almost gone. I started out with pressure and pain across my left cheek; after two days of neti-potting it had moved to just the bridge of my nose. After three more days the afternoon sinus headache quit showing up. And now on day eight, the pressure is gone - just feel a little stuffy. Very happy about this!