I have a pinched nerve. when moving my neck, i get pins and needles in my left arm. what should i do?

Cervical Disc: Your symptoms of paresthesias in the left arm with neck movement are commonly seen with a cervical disc herniation. Oral steroids may be of benefit to reduce any inflammation of the nerve but an MRI scan would be warranted if the symptoms are not improving or worsening. Consider seeing a neurosurgeon and, at your age, one who is interested in arthroplasty for motion preservation.