Would the sharp pain from R elbow down that causes numbness & tingling in pinky, ring, middle fingers & now index be cubital tunnel? Thank you!!

No, ? TOS. 30's female with parasthesias in 5-2 fingers suggests primary neural impingement to be occurring in region of shoulder girdle brachial neural plexus, and concern is raised for Thoracic Outlet Syndrome. A Neurologist is skillful at localizing neural disorders.