I'm really lucky, the doctors are proud of my strong immune system and so whenever a cat bites me, (Fritti, my mom's cat, used to all the time, he was a really evil feline) I get a bit of a welt, like if someone used a miniature whip on me, and of course I wash it with good soap and apply neosporin on it, but that usually does the trick for me. Actually, it's always done the trick for me, but a friend of mine had to go to the ER because her cat bit her shoulder and it swelled like a balloon.
Hope you feel better soon! And it does sound like he was just out of sorts, and I hope he gets to feelin' better too. Though it looks like all he needs is a chill pill :P