I was not diagnosed until 2012, but from around 2010 until then, I knew something was not right. My symptoms started with chewing problems, then speech problems, (If I talked very long at one time). I was finally diagnosed in 2012 because I went to the eye doctor, and he said "I think you have MG". He sent to a neuro who did the blood test and confirmed it.
The mestinon took all my symptoms away, and I thought that mine must be mild. However, 3 years later that changed very rudely, and I had 2 crises spells in 3 months.
So, be careful, take you medicine, and listen to these people on this thread. They know what they are talking about.
Best of luck -let us know.
FREDH