You should start doing deep breathing exercise in continuity and avoid stressful environment, you should also check whether in which position you're feeling this sensation,ie: when seating, sleeping or standing.
Do it for a week and if still the episode persists then get your cardiac workup done to know any other findings.
Next Steps
post 1 week cardiac workup: ECG ,Tmt, 2d echo of your heart.
if any issues are still seen then feel free to connect.