My left arm has been bothering me like it feels numb?

Pinched nerve: Most common cause of focal numbness is carpal tunnel syndrome, at the wrist, but nerve pinching can occur at the elbow, shoulder, or neck. Less commonly, this could be an early sign of a problem within brain or spinal cord. See your primary care doctor first, and, if a persistent problem, may need testing to uncover causation.

Pinched nerve: This is most likly a pinched nerve in the neck called a cervial radiculopathy. See an orthopedist for a full evaluation.