There’s several tests you can have done. First, do you have heart health problems in your family? Have you ever been diagnosed with Anxiety?
You can contact you Primary Care Physician and have them do a complete work up, and ask to see a Cardiologist. Explain your fear to both Doctors. Request a stress test. This is a procedure you can have performed in a controlled environment, and you will know if it’s your heart, stress or a combination of the two.
I suffered a trauma in my younger years. After, which I started having chest pains. This compounded my fears. I had a stress test performed and was clean. Later, I was diagnosed with severe anxiety. After identifying the problem and getting help, I no longer live in fear.
Best of luck,