Thanks for your question on Health Care Magic.
I can understand your situation and problem.
In my opinion, we should first rule out cardiac cause for your symptoms.
So better to get done ecg and 2d echo.
If both are normal then no need to worry for heart diseases.
Also get done chest
x ray to rule out lung pathology because your symptoms like
chest pain, breathing difficulty etc are seen in Pulmonary diseases.
If this is also normal than you are mostly having
anxiety related symptoms.
So better to
consult psychiatrist.
Get done
counselling sessions. Try to identify stressor in your life and start working on its solution. Anxiolytic drugs are also important in your case. 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.