Annie, Have you had your thyroid tested lately? B12 levels? Don't blame it all on the Vit. D. deficiency.
At some point, you may have to give in and go somewhere else for help. It sure would be a heck of a lot better than what is going on now. See if your primary or pulmonary doc can refer you to the University of Kansas Medical Center.
http://www2.kumc.edu/neurology/barohn.html
You would not be treated well at Mayo. Kansas is not that far away. Maybe when the weather gets a bit better. You need someone to fully evaluate you, from head to toe, not only in regards to MG. What you need is a full blown physical.
I'm sorry you are feeling so down. So many of us know how hard it is to feel sick and not have answers. But you can't give up hope, ok? Rethink your situation and get someone who has been PROVEN to be kind to help you.
Annie