Part of it could be stress... I've never had to socialize a new cat before, and it's sorta aggravating. I just want my two cats to get along, but they just keep hissing and growling when they see each other. *sigh* I will feel so much better when they don't do that any longer.
And part of it was probably overeating. We had pizza last night, and I really stuffed myself. It certainly didn't help the reflux any. *sigh*