What is the most painful thing you have gone through in parenthood?

I need to qualify that I am a new mother as well - so my experiences are still very limited. But I do agree with Diana - for me the most painful thing has been my breastfeeding journey as well. It hurt like a thousand little knives twisting off my nipple every time my baby latches. I wish someone had warned me about the physical pain of breastfeeding. It is also mentally torturing as you keep wondering if you are producing enough milk and how to boost your yield. And the guilt you need to deal with if you can't breastfeed.