Are you certain you had optic neuritis as a child? That would be pretty uncommon. At any rate, any opthamologist could examine your eyes and see if there is nerve damage there.
Have you told the doctor who is treating you for lupus about the hand clenching, eye problems, and restless legs at night? Since those are new symptoms, they need to be reported to him. They do occur in some folks with MS, but they can occur for lots of other reasons, too. Since your MRI's are old, it seems reasonable to request that they be repeated. Perhaps now that you have the new symptoms, the doctor will do that for you. If not, you could always go to another doctor.