here we donot know your age as well as other risk factors for heart disease
like high BMI , family history , high cholesterol
, addictions etc .
Considering the nature of complaints it will be advisable to undergo
1 blood tests like BSL , Lipids
3 Stress test
4 Color doppler study of heart
If all the things are with in normal limits , then we can be reassured that this is presently not due to heart problem.