First off: Wolfgirl - "numb for days" is a bad bad sign! Usually that's compression of the peroneal nerve where it runs between the sit bones. Trust me, you do not want damage to that nerve! If I may suggest a wide (like 200+mm), flat-topped, minimally padded or unpadded, "T" shaped saddle for a substitute over the one currently on your bike, at least until after your bike fit? Ask around, someone you know might have something floating around their garage they might let you borrow.

http://forums.teamestrogen.com/showt...ghlight=saddle This might be a good place to start, but there is a better thread which I can't find right now. The gizmo at the bike shop is great for measuring center-to-center. Someone posted fabulous instructions for making your own gizmo with saran wrap and play-doh.