My two cents, Djjd:
After my first experience, and that was real pain, I learned a lot about renal calculi.
When I had my second experience, thirteen years ago, the paramedics took me to the clinic where I stood under drugs for almost two weeks, the thing being too small to undergo surgery.
Then I asked some familiar to make me a decoction of Lime tree sapwood.
I drank half the bottle, in the evening, then slept. In the morning I felt better having evacuated half of the stuff. Then I drank the rest of the bottle and three hours after evacuated the calculus.
It was over.
Now, time to time, I drink the decoction in order to "wash it out" and never had further problems...
Lime tree sapwood