When I was about 18 I suddenly developed a horrible allergy to my cat (and any other cat). I then moved out and away from her. It's gradually gotten better over the years so when I visit I don't go into a sneezing fit/get the whole puffy eye thing. But I desperately want to get a new cat of my own, and don't know whether my allergy is likely to come back fiercely. Has anyone had experience with cat allergies going away/coming back?