To pass out bacause of extreme pain one has to have felt it to that extreme.However is your dad okay now?Pain caused by stones in the kidney is usually intense,intermittent and radiating in character.
If he did have a stone it is a good thing he has passed it-if he has.
Keep an eye on him for above mentioned type of pain or any further complaints of passing blood in the urine.
If so, visit your doctor.if he has settled down then relax
Thank you for your response. He is okay now; they let him out of the hospital. All of the test they ran came back normal. The doctor feels 99% sure it was a kidney stone and that he went into shock during the passage of it. When my mom found him he was sweating, whispering saying he was nauseous but couldn't communicate so she called 911. Crazy!