By the sounds of things, I got off lucky by not breaking the collarbone. Seems like it frequently goes along with a scapula injury.
Went to watch the races last Sunday and a young guy went down in a crash similar to mine. He ended up with a broken scapula, 6 broken ribs, broken clavicle, broken vertebra, and severe concussion. Organizers said it was the worst injury they've had there.