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There is a long list of conditions that can cause numbness, but the doctor at the Cleveland Clinic would have considered those possibilities.
If the biopsy is normal, then that would be consistent with the assessment of the doctor at Cleveland Clinic. However, that assessment did include a conclusion that the anxiety was magnifying your symptoms, so there is a component of anxiety present.
That is why I have told you several times that you need to also treat the anxiety and depression in addition to the treatment for the spine.
It may take several weeks with progressive adjustment of the gabapentin dose to adequately ease symptoms.
Exercise is an important component of management of spine problems, and once you are in Physical Therapy, they will discuss exercises that you should be doing.
All medicines that are taken chronically take a while to achieve the full effect. If the full effect occurs with a single dose of a drug, then we can prescribe it to be taken as needed.
Hopefully it can be scheduled sooner.