I have SLE as well, but I highly recommend you see a neurologist with the idea of ruling out CIDP. It’s a chronic inflammatory demyelinating polyneuropathy that causes peripheral neuropathy and muscle weakness, balance problems, falls. It is similar in pathology to MS. MS affects the brain and spinal cord whereas CIDP affects the peripheral nerves that branch off the brain and spinal cord. It’s progressive and causes serious disabilities if not treated early and aggressively. My rheumatologist didn’t recognize it and I spent a decade getting worse to the point of having to use a wheelchair before I was diagnosed with CIDP. Please get a second opinion from a neurologist who is a neuromuscular specialist.