When should you move about to the ER near a kidney stone attack?

When should you move about to the ER near a kidney stone attack?
asap!
If you really have a kidney stone "attack", you will know to turn to ER immediately as you will hold unbearable distress.
It will let you know !! Promise !! You will probably perceive almost like you are giving birth. I've done both, it's not slightly as bad as giving birth but can come close!
believe me if you hold a kidney stone you will know when to go to the hospital when you catch that pain from the stone moving its the worst discomfort i have ever feel