I used to work and stand on my feet all day and looking back - I think I had MG then. I am not dx yet but suspect I may have it. My symptoms were there all my working life and gradually I got weaker and was called lazy and not a team player. But - I did manage it then. Prob could not now though. I used to lean on the counter when the Boss was not watching and have little rests but after a while the others would 'dob me in' so that is when the lazy tag started.