Hi I am suffering from sensitivity in hands feets as well as scalp and face. From past one year It has happened thrice ,it happens for a month or two becames dormant and then reoccur. I was diagnosed with vitamin b 12 defeciency iam.om tablets and injections from last year , also my mri brain ,mri spine and nerve conduction test is normal. What should I do? What could be the reason for it?