What you have to do is to see an internist!
A good history, physical examination and ECG may most likely exclude heart disease. If in doubt, he may ask for more investigations - especially an ECHOcardiogram
and exercise ECG. Coronary Heart Disease
is not common at this age unless there are risk factors like strong family history, high cholesterol
, smoking and so on.
Stomach and oesophagus problems can easily be diagnosed by endoscopy. It is done as an outpatient and gives immediate diagnosis...
In the mean time, you may try PPI (proton pump
inhibitors like omeperazole), may be with prokinetics (like domperidone
Wishing you speedy recovery