Thanks for your question on Healthcare Magic.
I can understand your concern.
Yes, you should definitely rule out cardiac cause for your left sided chest pain.
So get done ecg, 2d echo and
stress test (trade mill test).
If all these are normal then no need to worry for heart diseases.
Uncontrolled asthma can also cause similar kind of pain with breathlessness.
So better to
consult pulmonologist and get done PFT (Pulmonary Function Test).
PFT will tell you about severity of the disease and treatment is based on severity only.
You may need longer acting bronchodilators (formoterol or
salmeterol) and inhaled corticosteroid (ICS) (
budesonide or
fluticasone) for better control of asthma.
Avoid stress and tension, be relax and calm.
Don't worry, you will be alright with all these.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.