Piece of advise from someone that also got rear ended and also stayed upright by holding on to the handle bars..
You are not fine even if you think you are. almost two years later I started suffering from back pain and other complications and end up with a full year of pain.
My accident was in 2010, 2011 was fine and I started having issues since 2012 last year been the worse one.
Call insurance as they might need to cover the extra health expenses OHIP won't cover