Talk to any paramedic, and you will get lots of great stories. An ER doc is also another good source.
I have a bunch of stories from my own ER/EMS experience. It is a crazy mix of people you get, ranging from neglectful parents, sick kids, dying old folks, to the straight-up psycho.
Sometimes, after having to deal with the really crazy ones, I wonder why I even chose the career of medicine. It is also strange how desensitized I have already become, especially to dead people.
Other than that, several blogs online have great stories. Try looking up "fiznat" aka baby medic and you'll get a bunch.