I'm sorry if you've already covered this (I haven't gone back to read your posts from other threads), but have they done an EMG/NCS? Was it normal?

I have diplopia...but I was the one to notice it, not a doctor. Can you not tell you have double vision?

Well, at least 40% of people with autoimmune disorders are sero-negative, so the negative ANA & RF don't discount AI disease. But, that being said, absent any other symptoms, you probably don't have one. Fatigue (profound), and other symptoms usually appear if it was an issue.

I would suggest you bring up the brain MRI at next visit.

The other thing that may be helpful, is to journal the changes you're experiencing. With rapid onset neuropathies, this can prove quite helpful. Just jot on a calendar when something new takes place...and go back to see what you can document in regards to how this developed and when.

Was there any medication you started (or recently prior) at the onset of this? Toxic neuropathies can also present this way. Many antibiotics can cause wide-spread neuropathies.