Dear Worried,
I was in the same boat as you last March. I searched many websites for info and finally reached someone who said, "Do the flush (Hulda.) If it is too big it won't come out. If it comes part way out and you feel pain or have dark urine, take Magnesium Oxide (healtfoodstore). It will dilate the ducts even more. Then try coffee enema in the am after the flush to dilate again and help drag them down. If you don't get the big ones out the first time do the cleanses and such listed on this site to make your body ready to release them. I had great success with the chinese herbs on sensiblehealth.com and StoneFree by Soloray. I also took AF BetaFood by Standard Process (any chiropractor will sell you some) It took me until July with flushes every two to three weeks to get the big stones out. Mine were under 1cm, but my ducts are small, so everyone is unique. Good luck. I am so glad I tried the flush method instead of surgery. Many other physical problems, like muscle stiffness, and general "old feeling" disappeared. All the best with your decision.
Lynn