Can we have an "other" vote?
I certainly wouldn't say that I'm a wreck in the lead-up to my period. My normal pattern is that I get really horny about 7-9 days before my period, and then that libido gradually declines as I get closer to menstruating. A day before my period starts, something in my life that might otherwise be bugging me (but not bugging me that much) will just suddenly make me very sad, and I'll feel like crying. That effect only lasts about 12 hours. After that, I'm suddenly horny again. And then my period will start.
I've never really been on birth control, and my cycle is a bit irregular (still, at 33), so I've always found this emotional pattern to be a really good way of predicting when my period is coming. When it starts, it's very painful, so I'm often a bit short with people over those first couple of days - but really that's just pain and fatigue talking, not hormones.
I always thought it was quite funny that one of my ex-boyfriends used to whine and carry on about how "emotional" I got when my period was coming, and that made him very dismissive of any gripes I had (regardless of whereabouts I was in my cycle at the time). I was his first girlfriend though. After we broke up, he married another girl... and I heard through friends later that all he did was whine about how crazy she was during her period, and how sane and steady I'd been by comparison. Karma's a bitch.