I have them also. Doc said one kidney is filled with and size stones. For the past two years I've drink lemonade, i was told the acid in lemons help break down one type of stone and it seems to work. If I feel like one is moving (getting the pain in back over kidney) I'll get some simply lemonade and add four or five good sqirts of real lemon juice to it and drink it down. I can feel the pain reduce within a hour or so.