You can tell if you have a stone stuck in the entry to your gallbladder if you have trouble rotating your right shoulder (a little stiffness or mild pain). I had a couple of stuck stones, but they never hurt. I wouldn't have known about them except that my physical therapist could tell because of my limited arm movement and, after she pointed it out, I could feel the stiffness. The stones were always gone after the next flush. Having a stuck stone was a real fear of mine, as well, and I almost stopped after I heard that I had a stuck stone (even though I couldn't feel it), but I kept going and it was fine.