If it is possible, maybe get a second opinion: endo wise. Also talk to your neurologist or whoever handles your MG. I would do both if it were me :/

I agree with you on the radiation, I wouldn't want that, it sounds like it'll make your problems 5x worse when it may actually be on it's last leg out.

Don't get too discouraged, at least not yet. Hopefully there is an answer in there no one has pointed out yet. *hugs*