My first obvious sympton was ptosis. During treatment this progressed rapidly to diplopia, then tunnel vision and other wierd vision symptoms. I tested positive on the blood tests. My neuro prescribed Mestinon and prednisone. I took the Mestinon the first day as it is supposed to have an immediate but temporary affect. It had no affect. I started the Prednisone the second day (and stopped the Mestinon). It immediatly clearing up the issues with eyesight but other Mg symptoms have gradually become worse.
It has also taken me 2 years to ween off the pred. I started at 80 MG a day and I am now at 10.