Welcome to the platform of Health Care Magic.
Dear friend, as you have described about the numbness
of whole limb. I sense, your are also suffering with some milder form of brachial plexus irritation
could be cervical spondylitis
), You require a X ray
of cervical region to exclude this common problem.
This can well taken care by orthopedic surgeon and a physiotherapist.
Hope your query is answered,