If I understand you correctly you did one Liver Flush 2 weeks ago and since then you have had a sensation in your left abdomen that feels like something is rolling around there and some gas and bloating. Did you do any preparations before doing the LF? Most methods of Liver Flushing advise doing a parasite cleanse and then a way of dissolving hard calcium stones before the LF. Although some stones may have come out you will have to continue on with more LFs to get more stones out.
If you are in pain or very worried about this sensation they can do some tests to evaluate whether this is a serious problem.