Everyone has given you excellent advice and, if after trying these things you still see no success, ask your vet about Clomicalm. It's for behavior problems in dogs but has been used successfully w/cats. I have 4 of my cats on it for aggressiveness and inappropriate peeing. Try all the other things first because many of us feel that medicating a cat for behavior problems should be a last resort but, as I said, if all else fails, give Clomicalm a try. Or kitty Prozac. Good luck.