@johnbluffside - Yes, there are tests for diagnosing neuropathy? Neuropathy Commons has some good information to learn more here - https://neuropathycommons.org/diagnosis/diagnosing-peripheral-neuropathy

I know it's difficult when you hurt all over and don't have any answers. I don't have IBS but have read that it can cause pain all over. Does this sound like your symtpoms?

"Can IBS cause pain all over body?
People with IBS frequently suffer from headaches, and backache, urinary symptoms, tiredness, and pain in many parts of the body."
--- Is this IBS? | The IBS Network: https://www.theibsnetwork.org/have-i-got-ibs/is-this-ibs/

Have you thought about seeking a help or a second opinion at a major teaching hospital or health facility?