Shock like pain at upper chest area.

I have been experiencing a shock-like, electric current-like pain in my upper left chest area for the past one year. Sometimes the pain radiates towards my left shoulder, and at times I can feel it across the entire chest area. The pain feels like a sudden electric shock and occurs repeatedly throughout the day. It has been persistent for a long time and is causing me significant anxiety because I am worried that it could be related to a heart attack. I have already consulted multiple doctors, including general physicians, a homeopathic doctor, an orthopedist, and a cardiologist. I have taken the prescribed medications and undergone several tests, including blood tests and an ECG, and all the reports have been normal. Despite this, the pain continues, and I am unable to understand the cause. Could you please advise me on what type of specialist I should consult next and whether this kind of pain is something I should be worried about.. Thanks