I have had kidney stone pain several times. The only supplement that has worked to remove the pain is Phosfood, made by Standard Process and available through your natural health practitioner.
When I had to go a hospital with kidney stone pain, they kept me in a room for 3 hours, did a cat scan, confirmed it was "just" a kidney stone, gave me a Vicodin prescription and sent me home. Then I got the bills for almost $4,000! Ridiculous. All because I couldn't reach my chiropractor on a Saturday! Now I ALWAYS have a bottle with me.