I have wooden flooring throughout my house and got rid of my cat a year and half ago because of symptoms. I am a healthy eater, rarely drink alcohol, non smoker. you are right about the lack of fresh air though, Ive hardly been out in a week and a half as weather has been so bad here, lots of snow and ice. The problem has been ongoing since before the summer when I was out and about loads. I dont drive so tend to do a lot of walking. Cant work out why my immunity is so low.