Sometimes back pain is more kidneys. To check if it is from the liver/gallbladder (pain travels) take a glass of water with 1-3 tsp Epsom Salts . If the pain subsides it will be the L/G. The Master-Cleanse often creates gallbladder trouble like it says on the the top of that forum.
I would start doing the liverflush and keep doing it every 2-3 weeks till no stone/sludge comes out anymore.