I'm putting in an "update" for reference purposes for others, since there is SO LITTLE about female-specific cycling health specifically pertaining to the soft tissue/crotch issues. I have spent lots of time on the net, have spoken to two PTs (one who specializes in women's groin/pelvic girdle health issues), and a GP. It is the pudendal NERVE (not artery) that has been compressed. It is very rarely a permanent injury. It is a slow healer--we're looking at easily 6 weeks. There is not a lot one can do to speed the healing process, but the pelvic health PT recommended icing. . .fun!
In the meantime, I can finally tell that some healing progress has been made--but I'm still pretty numb. I did a careful spin yesterday on a very upright bike, and alternated sitting way back on the hip bones to spin with being up out of the saddle to spin--one position per song, so I was up 50% of the time. It does not seem to have had an adverse effect.
So that's the scoop! As they say, all's well that ends well!