KJ,
Interesting about your misdiagnosis of nerve palsy. My experience is similar. Initially, they were quite sure my double vision was from MG, but when tests came back negative, then said 4th nerve palsy. I've always felt that was just a default diagnosis. Now eight years later, MG is being looked at again.
I've never had the ice test done, but then I don't have much ptosis.

Good luck to you at your next appt.

Cate