Since you are a diabetic and also have CAD, you fall in the category of immunocompromised patient and since you are a health care worker you are also exposed to various health hazards , TB being one of them. Thus you are at double risk of getting TB as compared to a normal person. I suggest you get yourself thoroughly checked up with various tests for TB which will be of great help. You should consult a pulmonologist
at the earliest, who can guide you further regarding various tests.