NMFFM, I had a "clump" get caught during a flush. It scared me more than it hurt me.
At the time I was already taking Julia Chang's GCG, so I upped the dosage a bit, I kept hot lemonaide by my side, probably added acv and/or es to it. I'd determined to do another flush the following weekend ... I'm single and working and I HAD to work. I'd known the stone was stuck on Sunday night, on Tues morning with no flush cocktails, I heard that familiar gurgling and knew to be heading for the pot. I passed 2 grape-size stones that were black and a good handful of what I'd call black sand. Something that size was stuck in my liver BEFORE I flushed, perhaps it was just the next thing to go and wasn't quite ready. IMMEDIATELY on that moving out, a major part of my liver pain was gone for good.