I don't know why you would have fainted. Were you in pain?
I have done 3 Liver Flushes and haven't gotten hardly any stones either. Most people don't see a start with stones until after the 6th flush, or so. Yes, there are some blessed people that get them right away. My liver is congested, so the stones need to be softened to get them out, that may be your case too.
I don't believe you made any mistakes. I would try it again in 2-3 weeks, and make sure that someone is there with you, just in case.