Did you try calling the neurologist's office and telling them that you have myasthenia with breathing difficulties, and was started on prednisone (at what dose, by who?)
I believe that they will see you ASAP in that case. If not, you better find another neurologist anyhow.

I'm new, too, and your thread, mw3kgt, made me want to post. I, too, had a neuro-optha dx me. I'd had a borderline AChR binding test 2 mths prior (with a terrible neuro), and the neuro-optha dxd me with MG "regardless of what the blood tests show" but ordered one more round of tests anyways. This time he added modulating, blocking & MuSK. Binding came back positive & I found out on 10/25. Since he felt it was likely systemic and not just ocular he is sending me to a neuro for treatment. I go on 11/16 and will have an EMG done. I would say it only took about 8 or 9 months to dx, but that's only after the worst symptoms of double peripheral vision and blurriness in the right eye, along with mild pstosis. I realized after I began my pursuit for a dx that I had had a droopy eye over a year ago that went unexplained. I had attributed it to allergies at the time.