Chest hurts. out of breath walking short distance. do i have pneumonia or pleurisy?

Unlikely: Shortness of breath on exertion with chest pains sounds more like a cardiac condition or copd. Pneumonia is characterized by coughing, sputum production, fever and sob at rest. Pleurisy causes chest pain on inspiration. I suggest you see your md immediately and get checked out.

Not specific: Shortness of breath with exertion along with chest pain is a potentially serious problem with a number of possible causes. These include heart disease, asthma, copd, or other problems. This needs to be evaluated by a medical professional promptly. One should avoid vigorous exertion until the problem has been fully discussed with ones doctor. For chest pain that persists one should call 911.