Decades of on/off pain/pressure at inner left arm above elbow, accompanied by finger numbness and dull feeling under left jaw. occasional sharp chest pain on left that comes and goes quickly. not usually associated with activity, even walking uphill?

In view of associated arm discomfort & for thoroughness& peace of mind,I recommend having a treadmill stress test even though cardiac pathology is an unlikely cause of your symptoms all these years. Your chest pains are nonspecific. I suspect nerve impingement in the upper forearm is the problem. A hand specialist would be best to evaluate you for this. Appropriate testing will be done.