Do you have any history of
diabetes, hypertension, smoking, drinking, family history?
But as you are young,and your ecgs and CBC are normal,it is less likely that you have a coronary artery disease,but nothing can be said without proper history taking and examining.
Next Steps
Go ahead and do a 2D ECHO,to make your self more confirm.Also do RBS,
thyroid profile,
vitamin D level.