GAH! I know exactly what that's like. My bf thinks it's bs too. But I think he's starting to catch on. I don't think I get exceptionally bitchy, but I do get really emotional, and everything makes me cry. So, everytime the sobbing starts when I hear an emotional song, I point out that it's PMS.

"See! Right here, staring you in the face. I don't always cry to the Wicked soundtrack. Just when I'm PMSing."

I think it's sinking in.