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 rule out Pulmonary causes like
asthma or
bronchitis first.
So get done PFT (Pulmonary Function Test).
If this is normal than no need to worry for major lung related causes.
Your symptoms are mostly due to stress and anxiety.
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.
Don't worry, you will be alright.
Avoid stress and tension, be relax and calm.
Hope I have solved your query.
Wish you good health. Thanks.