"It wasn't until my EMG that I was told what actually was causing it and it was due to nerve damage due to a condition caused by Ankylosing Spondylitis I've had, affecting my spine."
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I went through the same process but nobody said my diffuse peripheral neuralgia was autoimmune related. I have never been diagnosed with diabetes in spite of all the prednisone I took over the years. All I was ever told was that Prednisone "can cause peripheral neuralgia" but the neurologist said mine was idiopathic.

Now I try to tell my doctor that I think my peripheral neuralgia has improved since being on a biologic and I got off Prednisone. I suppose that being off Prednisone has helped but maybe my autoimmune disorder is controlled better and that might explain the improvement too,

If the neurologist doesn't know what caused my peripheral neuralgia in the first place then they probably won't know why it seems to be improving. I don't even know for sure if it is improving. I somewhat want to do another EMG/NCS test to see if it is getting better ... except the fact that the EMG/NCS tests already done weren't very pleasant.