Unfortunately I cannot make many specific comments about your case, there are too many things I do not know about your condition and tests
Numbness that is localized right underneath a blood vessel could be from local irritation of that area. Numbness that is on the oppiste side of the body to a brain lesion could be from that brain lesion or a seizure triggered by that brain lesion. In the case of a possible seizure, an EEG might be indicated.
A slightly elevated ANA is usually not significant, and does not indicate Lupus. Other antibody tests are more specific for Lupus. These tests are very likely to be negative if you have no signs and symptoms suggestive of lupus (called the pre-test probability of the test). Numbness and joint pain alone is not very specific for lupus. ANA does not usually change much over time, in the elderly it can be falsely positive purely due to old age.
A visual evoked potential is sensitive to optic nerve dysfunction that can occur sometimes in MS. It is just one part of the diagnossi of MS, and even if positive and there were no other signs of MS, this would not make the diagnosis.
Good luck