I am also a double Sero negative. I suffered for five (5) months. I lost over 50 pounts and went to 3 different neurologist. The last neurologist was at Johns Hopkins in Baltimore. After being put through a battery of test; I was finally diagnosed with MG. I have been on Prednisone and Imuran for about four months and everything is back to normal. My blood is being monitored every three weeks.