This isn't quite "worst injury" territory, but I do have the dubious honor of being one of the only people I know who had to go to the Emergency Room twice in one day for two different conditions.

Protip: if the ER people give you pain pills which "may cause dizziness," and an inner ear infection has already fucked up your balance? Enjoy falling down the stairs!

Also, when you stand up again and go "that's weird, I don't feel injured, I think I'm okay!" that does not mean you aren't; that just means you are still high on pain pills.