I just found this on the internet....
Fact: Cats May Love Too Much
Behavior experts confirm that some cats really do experience separation anxiety when apart from a favorite person — and that's one reason a sweet kitty may pee on your clothes when you're at work. Other signs: the cat paces, vocalizes, or blocks the owner's path to the door. Left alone, she may vomit or be too worried to eat. For cats who love too much, behavior therapy can help -- along with anti-anxiety medications for severely affected cats.