Much pain along right side of right foot. What treatment. Dr. Prescribed naproxen. X-ray neg.

See below. Need to discuss this with your doctor.
Pain for how long? This area of the foot is prone to damage, especially in a person of your age (forgive me). If the pain is new, and especially if there was a specific triggering injury, damage may not show in the films immediately and another set may be required in a few weeks to confirm.