Did the doctor give you any information on MG?  Or ask you
about specific symptoms?  The NIH site

http://www.ninds.nih.gov/disorders/myasthenia_gravis/detail_myasthenia_gravis.htm

has this to say about symptoms:

"What are the symptoms of myasthenia gravis?

"Although myasthenia gravis may affect any voluntary muscle,
muscles that control eye and eyelid movement, facial expression,
and swallowing are most frequently affected. The onset of the
disorder may be sudden. Symptoms often are not immediately
recognized as myasthenia gravis.

"In most cases, the first noticeable symptom is weakness of the
eye muscles. In others, difficulty in swallowing and slurred
speech may be the first signs. The degree of muscle weakness
involved in myasthenia gravis varies greatly among patients,
ranging from a localized form, limited to eye muscles (ocular
myasthenia), to a severe or generalized form in which many
muscles - sometimes including those that control breathing -
are affected. Symptoms, which vary in type and severity, may
include a drooping of one or both eyelids (ptosis), blurred or
double vision (diplopia) due to weakness of the muscles that
control eye movements, unstable or waddling gait, weakness in
arms, hands, fingers, legs, and neck, a change in facial
expression, difficulty in swallowing and shortness of breath,
and impaired speech (dysarthria)."

I hope the doctor comes up with the right diagnosis.

--Bill Thompson