I am sure that this question has been asked before, and answered. But My eyes are too bad to go scrolling through thousands of pages.
My GP has given in and agreed that I can double my Mestinon. To 6 x 180mg.
He said "I don't know much about it."

and since an MG neuro said "keep increasing until you get side effects." there seems to be no reason not to.
But I know myself that there is a limit. My concern is that without proper medical oversight, that I might reach that limit without realising. I still don't have a dx, though the Mestinon still helps, though I do have to keep increasing the dose.
Any advice would be appreciated.
JJ