Andreas Moritz says that there are the rare individuals who take awhile to actually get out stones. He also says to not be discouraged. The flushes ARE working, they are each moving the stones that are blocking all the others closer and closer to the exit route. He says to just make sure you KEEP FLUSHING, and soon you will get the visible results!
After all, you did say you could even feel them moving inside you, didn't you?