It definitely sounds like your kitty had an allergic reaction, I'm glad to hear it is over now! I'm not sure whether your said you did or did not get the rabies vaccine .... but I know my Doxie had a really bad reaction that sounded very much the same as your kitty's! I hate that the law requires them so often ..... the rabies are actually good for 3 or more years, but our state requires them yearly. Of course, I don't get them yearly, as my babies stay inside, and I don't plan on being visited by the state!