Hi there, well I have "possible MS" diagnosis now. Finally.
I have MG for 4 years now, RA for 3 years, but around the same time I got other weird symptoms. First it was like "yeah but you have all kinds of diseases, etc" however, 3.5 years ago 2 different docs said, have you been tested for MS?
No I wasn't, but it wasn't until this month they tested me. (I kept asking, why not a brain mri or something??)
I haven't had all tests yet, but they're sure there's MS like stuff to see on my brain MRI.

So, it's possible I have both, yes.

I also have a lock jaw (no bananas for me!) but that's not related, I got it because I had an operation on my jaw 10 years ago.

MS lesions are the same as the lesions that are commonly seen with Chronic Lyme Disease, FYI. Jaw problems are also extremely common with Chronic Lyme.