I believe your passing gall stones. also the responder that mentioned the Epsom Salt is correct. opening the bile duct with epson salt makes things run smoothly. i have pics of my wifes removed stones during a gall stone cleanse.
she was very sick and very very afraid of surgery which the doctors said she needed the whole thing removed. she was told if she refused she can die. She came home and told me everything and she just really really didn't want surgery so i found a cleanse here much like with what you were doing, olive oil and lemon juice and out came the stones in the morning.
anyone reading this if you want to see the pics email me at lfis492a @ aol.com i'll send