Welcome @gracemh, Sorry you've been struggling for three years to get some answers and a diagnosis. You mentioned that you've seen two neurologists and one vein doctor which certainly seems like the specialists that should be able to help determine what is causing the symptoms. Neuropathy Commons has a good list of testing used to diagnosis peripheral neuropathy - https://neuropathycommons.org/index.php/diagnosis/diagnosing-peripheral-neuropathy. You mentioned weakness in the legs along with the bottoms of your feet being numb. Do you also have pain in your feet or legs? Have you had any nerve conduction tests or skin punch biopsy to check for damaged nerves?