Myasthenia Gravis Support Group
Myasthenia gravis (MG) is a neuromuscular disease leading to fluctuating muscle weakness and fatiguability. The hallmark of myasthenia gravis is muscle weakness that increases during periods of activity and improves after periods of rest. Although myasthenia gravis may affect any voluntary muscle, muscles that control eye and eyelid movement, facial expression, and...
https://www.nolo.com/legal-encyclopedia/how-health-issues-can-make-you-inadmissible-the-us.html
My thought is that since MG is not communicable, I don't see why it should be an impediment to your immigrating here. Ditto for Canada, especially since you otherwise qualify for express entry there.
Don't give up! Try to find a qualified attorney or maybe a disabilities advocate group who can advise you.
I have heard that if you have a Sam's Club or Costco membership, Mestinon is quite affordable. Also, I discovered that my copay (on my husband's health insurance obtained through his employer) is the same whether the prescription is for 2 weeks, one month, or three months. My Mestinon 360mg/day currently costs me about. $33.00 per month.
I meant my CellCept at 2000 mgs per day now costs me about $33.00/ month.
Generic Mestinon only costs me a $20.00 copay for 3 months worth at 360 mgs per day.
Also, your mestinon is very cheap and affordable! My mestinon costs me about $65 a month with 20% off already. The price went up this year so im really spending a lot for it.