You passed that stone on it's own, or was that in connection to liver flush?
Did you feel any pain when passing it ... or before ?
Have you ever had Gallstones attack? How many times?
It sounds as you have had some severe cut of the upper GI tract ... could be bile ducts or small intestine ... be careful with any examination ... especially if your doc want to examine your GI tract ... colonoscopy or ERCP .... those procedures can again cause injury and bleeding.
How do you feel now? Any symptoms? What do you eat? How old are you? Do you eat sugar? Don't!