A medical condition that caused him to wet himself?? Lol, I would have liked to hear that one! And +1, if he had a medical condition (and he's pleading it was the medication), I'm sure he shouldn't even have been driving.
What insurance company did he have, and who do you have? When I was both t-boned and rear ended (in an '07 Yaris I might add!), State Farm told me where to go, and not the other person's. One was uninsured, and the other one had Geico, and both times I took it to a State Farm approved collision center.
Did you exchange information with this guy? (do you know who he is?).
PS... In the event of being rear ended in a Yaris, did you know the back bumper fits nicely in the back seat?