Wowzer dude. Great to hear you survived without more damage to yourself. Going down at that speed due to an impact with a car, truck or trailer has to be up there on the % chance of getting seriously screwed one way or another. Not that having bone exposed to the air anywhere outside of an operating room isn't pretty bad. I don't leave the house without the helmet, ever, and your posts is making me seriously think about adding that mirror too.
Get well soon, hope your bike isn't completely toast, and hope the driver lives long enough to pay up your medical and bike repair bills.