My husband has a Pavlovian allergy. He is allergic to the sound of the vacuum cleaner. When he was a bachelor, he didn't know how to put the bag on right and he always got dust all over the place. We now have a vacuum with HEPA filter that works great, but the sound will just get his histamines flowing.
I recently realized that I get anxiety when I pay the bills or log into my bank account. Seriously - heart pounds, head feels light, palms sweat. I'm trying to log into the account more often to get over that feeling. Plus it's nice to see there's actually money in there.