Chanca Piedra & diarrhea

Hi Andreas -
In a previous post you had recommended that I try Chanca Piedra to break down a possible calcified stones - 20 drops tid.

I started taking it and it has really helped with the pain and discomfort in my liver/gb area - yay! However, I can not take more than 3-5 drops tid or I get major diarrhea and headache!

Is that going to be enough to help break down the stones? Why is it causing such sever diarrhea? I am usually very sensitive to herbs and things. I am 5'6 and weigh about 108 lbs - so very thin.

Any thoughts on this would be greatly appreciated. Thank you for all the work you do!

Georgina