I have the magnesium, have not been using it regularly. Will be more diligent. Does that mean that magnesium may neutralize this particular effect, allowing me to take the oxycodone, assuming the oxycodone was found to be the culprit?

That article and related ones seem to address a much higher usage than mine. Is it even possible that this is my problem? I am not too hopeful, but it is an easy fix, the burning is much worse than the muscle pain, stiffness and weakness.

Also, while I understand that one should only change one variable at a time to gain any real knowledge, I am in such distracting discomfort that I want to do everything at once to see a change as soon as possible. I can always re-introduce things slowly.

This body- wide burning can, evidently, also simply be a symptom of small fiber neuropathy. My skin biopsy did show fibers breaking down at the upper thigh. Since it works in a mirror image fashion, I assume the burning in my shoulders and upper arms is analogous to my hips and thighs, just as the muscle wastage in my feet and ankles is mirrored in my hands and wrists.

Thank you Mrs. D.!