question: I have had chronic shortness of breath day and night since January 25. I have been to a pulmonologist who put me through a lot of tests, nothing can be found. No asthma or allergies. I had echocardiogram done, no problem with heart or arteries. I m getting normal oxygen saturation levels in lungs upon rest or activity. My doctor and pulmonologist are baffled. I m going for further testing by a cardiologist. Any idea of what can be going on? I m able to sleep at night, the shortness of breath is still there but not as intense feeling.