I don't think you have any cardiac issue. But definitely you have to clear your doubt if you have one..
ECG doesn't show any gross changes.
In your age group having atypical symptoms, usually have very low probability of having cardiac issue..
I would suggest TMT test rather than CT coronary
calcium score.. TMT is good enough.
Next Steps
TMT
Health Tips
check up
Lipid profile, and be cautious if you have family history of premature cardiac problems.