Welcome to HCM
We understand your concerns
You should not worry about these first.
Heart burns happen in areas through where food passes, like throat, trachea, below diaphragm, stomach etc.
You may be experiencing heaviness in the reagion of chest.
causes gastric disorder and which in turn presses diaphragm wich in turn pressurises, lungs and heart region, resulting in heaviness and or sometimes pain.
Glad to note you quit smoking
Continue the good work.
Consult a GP to be doubly sure.