Returning sharp (brief) pain shooting down left pinky finger only when exhaling.what makes this even more bizarre is that i had this same feeling start 7 yrs ago,but instead it was in my left wrist/hand & vanished for many years only until recently?

Thoracic outlet: Symptoms of pain or tingling associated with deep inhalation or exhaling can be associated with thoraic outlet syndrome seek care with orthopedist or vascular surgeon

Ulnar nerve: Dr Brown makes an astute observation which may indeed lead to confirmatory diagnosis. This can be approached by EMG/ NCV testing or ultrasound studies over the left brachial plexus. Maybe a visit to a vascular surgeon is in order?