Hello, and thank you for posting on Healthcare Magic!
I would recommend that you be seen by a doctor for this problem. Since you had a full cardiac workup already, I agree that it is unlikely that these symptoms are coming from your heart. But to properly diagnose what is wrong a thorough physical exam along with many more questions would be needed.
that is not related to the heart can be caused by acid reflux
, anxiety, pneumonia
, muscle strain
, or other causes. As I said above, I would be unable to tell you which of these is most likely without asking many more questions and examining you. While you are waiting to see the doctor, you could try taking over the counter pain relievers such as tylenol to see if this helps with the pain.
I hope I have given you some useful information, and wish you the best of health.