What you say is very interesting (that only the Prograf led to improvement and all the other meds didn't).
There are studies that show that certain types of MG respond much better to prograf.

I hope you don't mind me asking,

Do you know what type of antibodies you have?
Was your EMG diagnostic?
How long did it take for the Prograf to work?

Good luck with your surgery, and hope it leads to further improvement.