Seeing pulmonarologist tomorrow for sob. chest x-ray, ekg and blood work all normal. could it be asthma, copd or emphysema? gp said lungs sound clear

Further testing: It could be anything asthma, copd, emphysema or congestive heart failure etc. Good that you are going to a pulmonologist for thorough check up.

Maybe: A full pulmonary function study with diffusion studies , a vo2 stress test and a high resolution ct of the lungs may be nedded to completely evaluate you shortness of breath. A simple cxr and physical exam is necessary but incomplete.

See pulmonologist: Many people with significant asthma, copd/emphysema can have at rest clear lungs. There can be other causes of shortness of breath.