Hi All, I am new to the board. Long story short, Dx in 1990 with MG had Thymectomy that same year. it took several years for me to go into remission. I have been symptom and medication free for about 17 years. Until a week ago. how will I know if it is just a flair up or a full blown relapse? on Prednisone and Mestinon and it is helping a little. Kind of scared. is there anyone else out there with a simular story.