Of course your being overly paranoid!! You live with cats and that is the way they make us!! They do something strange and we freak out and worry ourselves to pieces over it. That's your job as furmom and a mighty fine job you do of it too!!
I would have said it's probably no big deal but since we just got back with Pepper Jack and he has a horrible sore throat then maybe you should keep a close eye on him. Of course Pepper was really sick acting. I would watch him and if it keeps on then I would get him checked so the vet can laugh at you but we will all feel better!