I don't have an official diagnosis yet but. .. have a thymoma, mestinon really helps, and I have a lot of the muscular symptoms. Waiting for blood tests and emg (which was really, truly awful, as all of you know. ) I was a marathon runner, and now some days I can't make it .25 miles. Some days, like today, I push too hard and screw up the whole day. I'm lonely and scared... and trying to manage the holidays with four kids seems impossible.....