Hello, Your symptoms could possibly point to heart disease if no obvious respiratory infection in the form of cough/fever/expectoration(sputum) is present. Since you have not mentioned previous illness/ medication, I would suggest get following BASIC investigations done- CHEST XRAY (PA view), ECG, BP monitoring, blood test CBC. These will help to differentiate heart disease from lung infection. Then some advanced work up can be done.
Next Steps
You may revert back to me with above reports or consult a Physician (M.D MEDICINE)/ Cardiologist with the reports.
Health Tips
Avoid physical exertion, cut down salt intake, do above investigations without further delay