The tingling and numbness could be caused by Peripheral Neuropathy (PN). There are tests that measure nerve conductivity to determine if that's what it is and there are meds, like Neurontin, Lyrica, trammadol that can help with it. When you see the Doc next, ask him about
this possibility and also ask to have your Folic Acis tested. Deficiencies of Folic Acid and Vitamin B, especially B12, can result in PN. Whether you can identify a cause or not, there is relief to be had.
I hope you find some answers soon.
Keah a.k.a. Wormy
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