Flu medicine for a knee injury? lolno.
Alright then, because you never specified, I had to assume.
Alright then, painkillers, the fact that your body heals as long as you breath and eat and drink, or maybe, it wasn't as serious as you thought, and it wasn't fixed 'magically', they were just over reacting.
People tend to do that.
What makes you think God does not exist?
I don't want God to exist. I don't want an all powerful Adolf Riddler + Josef Stalin + Ghengis Khan + Kim Jong-Il + King George to control my life. I don't want to go to hell because I don't believe in your magical Sky Daddy. Why would you ever worship an evil entity?
You say, he's not evil, well:
The Christians have turned him into Adolf Riddler, terrible to his enemies but generous to his followers.