It's so hard to figure out because they all present similarly. My doctor was 95% sure I had mg! but all the tests were negative. They would like for you to have a positive test for something because some of the treatments are different.
I ended up testing positive for Lems, but they need to eliminate other things, such as ms, als, etc.

It is hard not to think it is in your mind especially when the symptoms wax and wain.