Thanks, the good doctor. Yes, it's definitely a sinus infection. In answer to "have I been prescribed...": sort of/maybe/not sure, I've gotten so good about preventing sinus infections that I don't even see a doctor about it any more. I vaguely remember (from years ago) telling my doctor that I did the saline spray, and getting their approval, so that's what I still do. Something like one of these:
...which has a self contained aerosol that pushes on a bag of saline water out the nozzle.