Chook - DO make an appointment with a physio and have a look at this information from the Pelvic Instability Support Association here Home If you google pelvic instability you'll find more information too.

As far as the relaxin thing goes, I asked my physio about this today and she says that she doesn't think it's "too much" relaxin that's the problem it's just that different women's bodies react differently to the same amount. She said that SPD was particularly a problem for women who are very flexible (and promptly showed me how bendy her elbow is as she's suffered from it too). I think there's something in that as I am generally quite flexible. She also said that pale skin/Scandinavian background seems to be a common denominator too.

So ... not sure where that leaves my initial theory but hey, I've been pain-free for a whole week now so woohoo for that!