Thanks for your question on Health Care Magic.
I can understand your concern.
In my opinion, we should first rule out
bronchitis in your case because you are having breathing difficulty.
So get done PFT (Pulmonary Function Test).
If this is normal then no need to worry for bronchitis.
Get done ecg and 2d echo to rule out cardiac cause because of
tachycardia (high pulse rate) and left
arm pain.
If all are normal then you are mostly having
anxiety related symptoms.
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. 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.