Becoming allergic to cats
I've started living with a relative of mine recently and she owns 10+ cats. since moving in two weeks ago I have felt extremely tired all the time, and I feel like I have a cold or flu. I have never had an allergy to cats as far as i'm aware. I lived with a cat during high school and I never had problems with them. Is it possible to just develop an allergy like this suddenly as an adult?