Southeast USA.
Doubt it's mold as someone suggested, for me here.
It hasn't been rainy. Was noticeable but mild inside my house. Was worse in the open air (driving with my car windows open on a nice day)(obviously not the smartest thing to do). Felt FINE inside a mall, so obviously the clothes dyes and perfumes did not cause a problem. A mall is also a very closed-in place, difficult to get any sprays in the air into the middle of a Macy's! ha!
All I'm doing (besides avoiding junk food) is something MH mentioned once. He said something about drinking fresh lemon juice if you are coming down with anything. I drink one lemon on most days, anyway. But I'm gonna increase the lemons for a while. Think that is a good idea?