Honestly, seeing patients with them pretty often, one told me to drink lots of water and just lightly jump up and down when the pain is bad, coming down hard on your heels. This allows the hydraulic force of the water to push the stone down. The pain is backed up urine swelling urethra. When I had one I tried it and it worked very well.

http://ezinearticles.com/?Natural-Kidney-Stone-Removal&id=1119649