DO NOT let your doctor treat you with Botox until Myasthenia has been definitively ruled out!!!!!

Botox is contraindicated for people with MG, and can cause real harm.

If your initial tests come back negative for MG - as is the case for 10-20% of people with MG - ask your doctor to let you do a Mestinon trial.
About the only people who can tolerate even a small amount of Mestinon are people with MG; if you can take it without getting violently ill, chances are that you have MG.

Did your neuro-opthamologist do an ice pack test on your eyes? That seems to be the test that "catches" a majority of MG cases which present with ocular symptoms.