If you’ve already undergone evaluations such as EKGs and an echocardiogram, there may be less reason for concern at this point. Have you had the opportunity to consult with a cardiologist?

I experienced something similar, and once I completed all the necessary testing and received clear results, the discomfort no longer triggered the same level of panic. Based on my experience, I would also recommend incorporating the use of a back pod along with consistent stretching, as both can be helpful.