I think it's supposed to be like to passing a kidney stone, and a fairly large one at that. Now THAT (if you leave out the size part), I've had some experience with--six times (the first five were the same stone, in the space of two months. Finally had to laser-drill the little horror.). I don't know how close it could come, because I was able to walk about a third of a mile from my apartment to the hospital on strikes one, three, and five (the second I simply endured for its two hours, and the fourth I "bought off" with Percocet).
My blessings to thee and thy offspring, Lady Stephica. Just warrant us that the young Alexander will be a perfect gentleman when he grows up...