Thanks for your question on Health Care Magic.
I can understand your situation and problem.
By your history and description, possibility of
stress and
anxiety related symptoms is more.
But better to rule out Pulmonary causes for your symptoms. So get done chest
x ray and PFT (Pulmonary Function Test).
If both are normal then no need to worry for Pulmonary causes.
Possibility of anxiety related symptoms is more in your case.
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.