@margvo Spot on with your findings! Your situation is very likely just like mine, my house is very old, and I have always thought the same thing with mold and other issues associated, I wish that I could just move to another house but right now totally out of the question. I'm looking also into purchasing a few good air purifiers for some of the rooms. It's really something that you saw 3 ENT's and a CT scan and the problem wasn't picked up as a possibility. I hope you have a good outcome with the nasal sprays and other things. Right now, I just don't know what type of nasal spray I could use.