My kitty recently died of the same thing -- she never showed any signs of illness until a day and a half before she had to be put to sleep. I am so sorry for your kitty and I know how devastated you are. I wrote about my kitty in my online journal that I linked to in my signature -- it made me feel just a little better. I don't know what to say to you, because I'm still not sure what I want people to say to me. The pain is still fresh. I will say a little prayer for you and your kitty, though.