Thank you for posting your query.
A 15-year old is very unlikely to have heart attack
Based on your symptoms, we should exclude any cardiac arrhythmia
(a disorder of cardiac rhythm and heart beat).
This can be done by an evaluation by a cardiologist, who may perform Holter monitoring to diagnose this condition.
Wishing you good health,
Dr Sudhir Kumar MD DM (Neurology)
Senior consultant Neurologist
Apollo Hospitals, Hyderabad