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You have Consult general physician first for clinical examination and evaluation...they will order relevant investigations like Blood grouping and RH Typing, Urine Routine, Stool routine test, Resting ECG, X-ray-Chest, Ultrasonogram of the Abdomen (Screening only) and Pap smear (for Women)
Cardiac Stress Analysis(TMT/CSA)
Pulmonary Function test(pft)
Echocardiography
S.
Calcium and Phosphorous
S.
Electrolytes
HbsAg...chest x ray,pft and clinical examination can detect functionality of your lungs... Consult any medical college hospital or multi speciality hospital they will help you further
Regards