I get heavy breathing even on slightest of work i do,.. and then there is this constant pain in my left shoulder which sometimes goes upto my chest.is it worrisome? do i need to check with some cardiologist?

Yes: that you are short of breath even with the slightest work may be deconditioned state, pulmonary or cardiac. Given that you are of South Asian origin, Coronary disease is high on the differential, especially since you also have chest pain albeit constant shoulder pain. You need to see a cardiologist asap; get a resting ECG, stress echocardiogram and fasting lipids at a minimum for workup and treat