Have you told your doctor about it? Leg pain like that should always be investigated. Peripheral artery disease is a common cause. Yes, it could be from MG but it could also be from lots of other things like clots or an imbalance in electrolytes, etc. Maybe your doc could have standing orders for a blood chemistry for when it happens again.

Does it happen any other time? After walking a while? Maybe keep a journal too, like what you had for dinner the night before they happen (i.e., high potassium meal, like with tomatoes, etc.).

It's definitely worth a trip to your internist.

Annie