I sincerely appreciate your response and query. The early symptoms I had were some heaviness in my feet followed by burning sensation. Based on MRI result, my first neurologist thought that the cause was spinal stenosis at my L4/L5 and L5/S1 level but I changed my focus subsequently when Mayo Clinic thought that my lumbar issues are too mild to cause pain and burning of such degree. Their diagnosis were small fiber neuropathy although they didn't find any reason following a series of blood and other tests designed to obtain a comprehensive assessment. Although the series of tests didn't include punch biopsy, the Mayo team was sure that it was small fiber neuropathy. Why I want to try the Spinal Cord Neuromodulator is because nothing else has helped me thus far.