Welcome to HCM
We understand your concerns
I went through your description and am almost sure that you are doing well. You are just 30 and you have a lot of splendid life left and you should be successful. There is no room unnecessary thoughts which make you mentally sick.
As there is no previous problem of any cardiac illness or lung disease or blood deficiencies, there is nothing to worry. Chest tightness
also comes due to acid reflux
which makes us anxious and we feel breathless.
Exercise or working alone cannot give you breathlessness, but associated anxiety
that something might happen to you surely makes you breathless.
Therefore, first confirm with a general physician that you are physically perfect. Then consult a psychologist
for further advice.
Hope I am able to give you a good reply. Can contact me for further queries.