I would try coffee at noon then. Just add an extra cup a day and see if it helps. It is food, not med!
I had so many 'sinus' infections treated that weren't sinus at all, that I never suspect them at all now. Like many others, I also had the roto rooter sucky one too. Doctors were determined that it was causing my hits. Nope.
Glad to know that you are getting a scan!