Pain

Gave birth.
To a 4.18kg (9lb 3.5oz) baby.
No anesthesia whatsoever (not by choice... I asked for an epidural as soon as I got to the hospital, but the nurse-midwife told me, "No time for that, he's nearly out already. Two pushes and we're done." Two hours, an episiotomy, a vacuum extractor, and a broken tailbone later, he was out).

That's an easy winner right thar. Though I have to say I'm pretty stupid for not having ever guessed you were female, given your guild name.

On-topic: I got too many bangs on my head that I hardly remember any pain in my past. I don't know if that's a good thing.
Maybe not the worst pain per se, but this time I got some serious tingling on my left pinkie (lol, I know) and it kept me up all days and nights. It drove me crazy to the point I, on multiple occasions, wanted to just roll out of bed, go downstairs, get a knife and just chop the motherfuc'ker off for good.