As a runner myself I experienced a bit of what you are talking about. I was never a fast runner and did all of my marathons and half marathons using a Galloway run/walk program. I did a half marathon in Rhode Island in mid August and found while I never was winded my legs just could not keep going even with the run walk beyond 8 miles. Two weeks later I went to Disneyland for a half and struggled from mile 1 but pushed through mile 8 before walking in the last 5 miles. Again my legs were exhausted.

10 days after getting home from Disney the double vision started and my left eye would not open. within a week I was struggling to type and butter toast. I have tested positive now for MG and have had 5 plasmapheresis treatments and I am on increasing prednisone doses. I am still not sure if it was MG that was causing the troubles while running but I think things may be related.

I am hoping to get this under control as I am signed up for the Disney Marathon in January. It may be a long shot but I need a goal to keep my spirits alive.