Hello @jan64, Welcome to Connect. I think there a lot of different possible causes for a sudden onset of peripheral neuropathy. I know it's the pits after you have seen multiple doctors/hand surgeons but still don't have any answers. The Foundation for Peripheral Neuropathy has a list of common causes that you might want to scan through - https://www.foundationforpn.org/causes/.

Have you thought about seeking help at a teaching hospital or major health facility like Mayo Clinic?