Thanks for your question on Health Care Magic.
I can understand your concern.
Possibility of
stress and
anxiety related symptoms is more.
But better to first rule out heart diseases like
arrhythmia.
Arrhythmia is rhythm disturbance in heart and this can cause shivering, fluttering, quivering feeling in left sided chest.
So better to get done ecg, 2d echo and Holter monitoring (24 hour continuous monitoring of ecg).
If all these are normal then no need to worry for arrhythmia or other heart diseases.
Stress and anxiety appear more likely cause.
So avoid stress and tension, be relax and calm.
Consult psychiatrist and get done counseling sessions.
Try to identify stressor in your life and start working on its solution.
You may need anxiolytic drugs too.
Don't worry, you will be alright. But first rule out heart diseases like arrhythmia.
Hope I have solved your query.
Wish you good health. Thanks.