Thanks for your question on Health Care Magic.
I can understand your concern.
By your history and description, we should first rule out heart and lung diseases.
So first get done ecg and 2d echo.
Then get done PFT (Pulmonary Function Test).
If all these are normal then no need to worry for major heart and lung related diseases.
Sometimes
stress,
anxiety can also cause similar symptoms.
So better to
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.
I will be happy to help you further.
Wish you good health. Thanks.