This neuropathy can be due to Diabetes, Prediabetes,
Vitamin deficiency, and altered blood pressure status, any nutritional deficiency, and abnormal endocrine status, compression of nerve or impingement of nerve at time of exit from Vertebrae.
You should be doing HbA1C, ESR, serum protein/immuno-electrophoresis, and vitamin B12, BUN, and creatinine levels.
In your case it could be due to diabetes or dehydration, so you should hydrate your self well.
Keep me informed if you have any queries.