I do know that I have been tested a couple of times for MS, but only via non-invasive methods (MRI)... which can sometimes show issues In MS. However, I'm also aware (and so is my doctor) that only 40% of MS patients have lesions visible on the MRI.
So, the fact that I don't have lesions is not conclusive evidence that I don't have MS.
I'd push harder on it and ask for a spinal tap... but the truth is that while I've struggled with some MS-similar symptoms, the muscle failure and weakness is VERY short-term and not months-long kind of weakness/failure. The fatigue could be anything. And some of the other parathesia and POTS related symptoms seem to be milder than they used to be. It doesn't feel like a strong enough case for MS for me to feel like pushing harder on verifying that it's not that.
I also think I've got enough family history and just-about-related-to EDS or other connective tissue disorder that I could potentially land there as well. Again, doctors are ruling it out on slim evidence and no one has done the genetic testing for it... so, maybe it's that.
That said... if we ever get a diagnostic test for ME/CFS - or dauer-perpetuating-state or whatever they end up calling this... and if I do not get diagnosed with that test? Then I might push harder for non ME/CFS testing.