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YOU SHOULD SEE A CARDIOLOGIST...
That you can run and play is against heart attack
. You are too young for it; if anything, it may a congenital heart disease
If the pain is related only to ‘long’ breathing, it could be pleural or pericardial. (Membrane covering the lung or heart)
Fast heart rate and black out are related and need early attention – It may be arrhythmia, heart muscle disease
) and so on. You need investigations – EKG (may be 24-hour monitor), ECHOcardiography
, TMT (Treadmill Exercise) and so on.
See your doctor as soon as possible / get yourself investigated / keep seeing till normalised.
Wishing speedy recovery