I'm so sorry to hear that! They're pretty scary, aren't they?
Do/did your doctors test you for an infection when you get stones? They are common with that kind of irritation in the ureter! An infection can kick up MG, too.
I only had kidney stones once. I found that I had been having a reaction to dairy that caused "serous inflammation" in my body's mucus membranes. It might have contributed to the stones.
Do you drink a lot of water? That's the one main thing they always say to do if you have them. I think it might be a good idea to see an endocrinologist. There has to be a reason for why you are having so many of them! An endo can check your parathyroid gland, calcium, etc.
Also, they can be caused by inflammation. Dairy/cheese and beef can cause inflammation in the body. What's sort of funny is that some homeopaths say that the arm drops when holding a food we might be sensitive or allergic to!
I really think having 51 stones is a bit too much! There has to be a reason for it. And your MG doesn't need the added stress.
Juanitad, I'm so sorry you had such a bad experience! You were very lucky not to have gotten worse.

Annie