Thanks for your question on Health Care Magic.
I can understand your concern.
By your history and description, possibility of
stress and
anxiety related symptoms is more.
But better to first rule out cardiac cause for your symptoms.
So get done ecg and 2d echo.
If both are normal then no need to worry for cardiac disease.
You are mostly having stress and anxiety related symptoms. So
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.
So avoid stress and tension, be relax and calm. Don't worry, you will be alright.
Hope I have solved your query. Wish you good health. Thanks.