[JenB]

Hmm. Interesting. At first glance I’d dismiss that idea since, in my own home, I have no issues (no fragrances permitted) and I can have a headache crop up outdoors if I am near a heavily perfumed person, but I see your point is more about built up over time resistances and lack thereof. Hmm.

[Jubal Madison]

One thing - is your home relatively new? The building materials now commonly in use contain a lot of chemicals. This is very unscientific, but perhaps you are loaded up in your home, which is tolerable, but the addition of the scent is the tipping point. It seems to me with all the chemicals we encounter, if you start throwing in their various combinations and individual human beings, it would be plausible.One thing my folks did is to start opening a couple of windows in the house a tiny bit, while waiting for the contractor to install the fan. After a couple of weeks, Mama started to improve and after a couple months with the fresh air her migraines were gone. That would be a low tech solution to possibly try, but be forewarned your cooling/heating bill will rise.---JM