I might opt to see how much genetic testing I could get--
 

--given the number of other issues you have that might impact on your neuropathy/myopathy--you are certainly "co-morbid".

Buit in your case, the treament possibilites would be very different if they could eliminate some possible causes of these, or even confirm them. Inasmuch as you have lupus, which can cause neuropathy/myopathy all by itself, and is often found with other autoimmune conditions, AND as many of the treatments for these might be ill-advised in those with certain hereditary neuropathies, it might be worth it to see how narrowed-down a diagnosis you can get. And you may just be advancing science at the same time.