If you are experiencing symptoms as you describe you should see a doctor. But I had these same symptoms many years ago along with loss of appetite which resulted in a great loss of weight. The doctors diagnosed me with pneumonia. One of the words they used was pleurisy, which is related to fluid in the lungs. When I contracted Pneumonia I had shortness of breath even going up 5 or 6 steps. What the doctors used to clear my lungs was steroids. Please see a doctor if you haven't already.