Thanks, Nell. I usually have at least a tentative diagnosis before I go to the doctors! I appreciate the info. I did google a bit. I wondered about sinus, though I don't have any stuffy feelings, and tried a benadryl which didn't do anything. No redness, watering, etc.
I guess I just absorb info from online, other people's experiences, etc and it either leads me to say "aha, that's it!" or it doesn't. But it's all very useful imho.