This can happen due to overuse of computers, work involving straining of neck, herniated disc, canal stenosis, bone disease, spondylosis, poor posture etc. A
MRI of the cervical
spine and nerve conduction studies may be required. Please consult a neurologist.
The other possibility of similar symptoms in one half of body is TIA or transient ischemic attack. This can be ruled out by a CT scan or MRI. To diagnose a TIA or mini stroke you need to have a MRI close to the episode.