What do you do when you "don't feel right"?

I don't know my mental state right now. I just know that something is "off". I've felt this way for the past few days, though, and I had even left my pdoc a voicemail on Saturday night. Since he doesn't work Mondays, he will not return my call until Tuesday night.

Technically, this is not an "emergency" where I need immediate help from him, so I'm not going to bother trying to get in contact immediately.

What do you guys do? How do you "figure out" what is wrong with you?