You can always try something that dissolves the stone; either Gold Coin Grass, malic acid, or some of the things that Spirit recommends (see Hanna's post).
Flushes go much better after you've strenghtened the liver with various herbs/foods. I do like Julia Chang's products, though they didn't do very well with Hanna. I take Chinese Bitters even though I'm stone-free, and will remain on it because it purges and cleanses the liver. I also believe it's helps me stay stone-free.