Hey Jigoku,
Welcome to the group! Your symptoms do sound typical of MG. I think it was wise to start out with half a mestinon and working your way up to a whole tablet. Did you mean you are having a CT scan of your Thymus? That would be the standard test to have. I hope you continue to do well on the meds and please keep us posted. Again welcome and ask anything you want. Everyone here is very helpful and friendly. Take care.
Hugs,
Pat
Avoid extreme temperatures, especially the heat. Rest as soon as you feel weak or tired, if only for a few minutes. Longer is better. Try putting cool compresses on your eyes, it may help for a while.