I'm having heart burn from chest to throat n left chest above breast?

Could be gerd. You may have acid reflux which gets better with antacids. You may have to try that first before looking for other causes.
Probably not heart. Considering your age its unlikely the heart. But a full physical and and detailed history with an ekg and labs would be good to asess the problem and use for future comparison. And of course quit smoking if you smoke, lose wt , and execise. Mae need endoscpy as well.