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Based on what you have told me, the peripheral disorder mentioned by the speaker is on track with peripheral nerve disease. In most cases, the feeling of socks on your feet could be easily attributed to peripheral neuropathy. You are lucky that your neurologist has done so many tests and that your vitamins and nerves are under control. Please continue to take the vitamins as per the doctor's prescription and remain patient. You will need some time to see improvements in your nerves. Also, keeping a check on your weight and living a healthy life will speed up your recovery while doing well.

While analyzing the problem it indicates nerve compression, If numbness is persistent If no relief from medications and Physiotherapy, surgery may be required. For the exact solution you need show the MRI report to the orthopedist. 

Some potential causes of your problm can be nerve compression, such as carpal tunnel syndrome, nerve injury, muscle strain, or other medical conditions. Consult a neurologist or an orthopedic specialist, who can evaluate your symptoms, perform a physical examination, and possibly order additional tests to determine the underlying cause.

If you are having freezing and tightness in the back of head then it could be a neurological condition that must be evaluated by a neurologist. And for low vitamin D3 you need to consult a physician or an endocrinologist.