I've shared your pain, brother. And that was with what was called kidney "gravel" - the stones were much smaller than your 3mm willie-wreckers. I'd take childbirth any day over kidney stones!
As you've already been told, keep them kidneys flushed. Cranberry is also a great help. I was drinking cranberry juice like water for months afterward. Only minus is I remember that it's high in calories. But, like most things, if you search for cranberry and kidney stones you'll get conflicting opinions - I'm saying that it worked for me.