Hi my first set of NC/EMG came back normal but my 2nd plus the ssep did not. I have had the brain mri 2 times and teh spine as well. I think it can check for MS but also rule out something pressing on the spine causing the pain and or issues in the leg. The contrast is no big deal unless you are allergic but most are not. It is just like when they put an IV in. Since they are mentioning lupus so on can you ask if you should see a rheumatologist? I had so many tests for auto immune and the reason is like others stated is it can cause these problems like PN but if you treat the underlying for ex if you had lupus or low b12 that would help the PN. Keep us updated and don't forget to keep all your records so you can compare and bring to the next apt.