Did you pass out from the amount of pain you were in? Or wasn't the pain any higher than usual? I have passed out from the pain before, and I often feel faint from the amount of pain.
I thought if this was your case you would have stated that, but I just thought I'd ask. I hope you are doing okay, and that the ER will be able to treat you. It does sound like you are in need of an xray and MRI if the falling caused this pain, even though it *might* be the RSD or fibro it would be a good thing to get it checked out.
Sending soft hugs your way!