Thanks for your question on Healthcare Magic.
I can understand your concern.
In my opinion, we should definitely rule out heart and lung related diseases first.
So get done ecg, 2d echo,
stress test, chest
x ray and PFT (Pulmonary Function Test).
Ecg, 2d echo and stress test are needed for cardiac diseases.
Chest x ray and PFT are needed for lung diseases.
If all these are normal then no need to worry much.
Sometimes stress,
anxiety and panic disorder can also cause similar symptoms.
So
consult psychiatrist and get done
counselling 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 with drugs and counseling sessions.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.