Not exactly what you were asking- but if you have never actually been tested for allergies (and you health insurance will pay for it) you might want to do that. I was suffering all spring/summer, and assumed I was allergic to my cat. I got allergy tested- I am allergic to oak trees and birch trees- and that's it! (which only pollinate in April and May). The doctor thought I had a sinus infection and acid reflux (I kid you not), I am almost done with a 14 day course of antibiotics, and omeprazole daily, and I am a new person. (I'm sure you want a good vacuum, either way- I have an ORECK which is pricey but I like, and I read they now have them with the hepa filter).