That's interesting that they recommended that. On the website it says
"Chinese bitters should not be taken in conjunction with GCG because they may be too much for the liver and gall bladder to adjust. CB is usually started first. After a few weeks of liver decongestion, GCG can be started to replace CB."
Perhaps doing them together is not recommended for people with very toxic livers.
Am I reading correctly that you are getting stones without doing a flush? If so, that's fantastic. Please keep us posted on your progress.