I see my Dr. next month and plan to ask about this. I know they have to run a genetic test, but it has so many MG related symptoms and some that I have, {ok, just about all except for the high arches} Just thought I would share this in case anyone is interested.

Friedreich's ataxia
is an inherited disease that causes progressive damage to the nervous system resulting in symptoms ranging from gait disturbance and speech problems to heart disease.

Symptoms typically begin sometime between the ages of 5 to 15 years, but in Late Onset FA may occur in the 20s or 30s. Symptoms include any combination, but not necessarily all, of the following:

Muscle weakness in the arms and legs
Loss of coordination
Vision impairment
Hearing impairment
Slurred speech
Curvature of the spine (scoliosis)
High plantar arches (pes cavus deformity of the foot)
Diabetes (about 20% of people with Friedreich's ataxia develop carbohydrate intolerance and 10% develop diabetes mellitus)
Heart disorders (e.g., atrial fibrillation, and resultant tachycardia (fast heart rate) and hypertrophic cardiomyopathy )
It presents before 25 years of age with progressive staggering or stumbling gait and frequent falling. Lower extremities are more severely involved.

These symptoms are slow and progressive.