Thank you for your question.Electric shock
like sensation, radiating arm pain
and numbness in fingers is very typical of cervical disc problems. A herniated or bulging disc
impinging on a nerve can cause these symptoms. MRI of the cervical spine
is needed to diagnose the cause of nerve compression. If the MRI does not show nerve compression EMG and nerve conduction studies of left arm would be the next step.
Please let me know if I can be of further assistance.