this post, you have listed the relevant symptoms
that led to the investigation of your heart
, namely chest constriction, breathlessness, and tingling in the arms and jaw. Those can be red flags for heart/circulatory troubles.
However, the patterns of your tingling, numbness, and muscle pain, plus the fact that the EKG was OK, point away from the heart, I believe, but your echocardiogram will give more specific information about that.