You might also want to try putting a Sharper Image Ionic Breeze Air Purifier in your office and home...seriously...my kitties have severe allergies...once I put the ionic breeze air purifier in my home  (and of course got rid of a lot of the dust)  my kitties had far less allergy attacks.This is a very informative video.  Undiagnosed food allergies could also be making your sinuses worse.Love the t-shirt!