Welcome to Healthcare Magic forum...
It looks like u might have had a congenital heart disease
called ventricular septal defect
when you were baby...In about 25% of cases the defect closes by itself and the child could continue with normal life. In your case the pain which you are experiencing now may be related to your stomach. You might be having a condition called peptic ulcer
which usually occurs due to erosion in the lining of the stomach or the first part of the small intestine
, an area called the duodenum
. I would suggest you to consult a doctor and discuss with him about the further management.
Hope this helps!!