Heart attack pain is often described as a sensation of a crushing weight on one's chest. There may also be pain in the jaw line area, or even upper back, and a shooting/radiating pain going down the left arm. With a cardiac event you are also going to have nausea (extreme) shortness of breath and dizziness/feeling faint.
Of course the frustrating thing about
these symptoms are that they are also often present with anxiety, especially a panic attack where they might all be happening simultaneously.
In your case however, it sounds like you are primarily dealing with the chest pain which would not be indicative of a HA...especially considering that you are not high risk.
So do your best to trust your doctor and keep working on your Health Anxiety management to reach the goal of not getting derailed by your anxiety symptoms...and eventually lessening/eliminating them altogether.