Hello!!! This sounds so very familar to me!! In 1992, my Spunky did the exact same thing. He had asthma!!! Please get kitty checked out by the vet. At first,Spunky was on Predisone(which I ams a RN do not like). He was weaned off, and was stable for a short time, then his condition worsened. Even though his pred was increased, he got worse. I did take him to a homeopathic vet, who got things under control. Spunky did have 2 very scary episodes of status asthmatus(sp?)which is ane attack after another. I was given and did use the lower dose of pred to head off such attacks, but it did not work. So off to the emergency vet we went. Spunky was maintained on 1 homeopathic remedy and one Chinese herb remedy. He died last September of kidney disease. Personally, I do not like the Hills diet. Our cats are eating Nutro and are doing nicely, Good luck with with your kitty. Sandra