Normal ekg, echo, chest x-ray, blood work and stress test. seen a pulmonologist and was cleared for ashtma etc. what would cause sob? its not anxiety.

Not anxiety?: Anxiety & panic attacks frequently cause shortness of breath, as well as many other physical symptoms. I'm glad you have such good results from your heart and lung evaluations so far. I don't know what your doctors will come to, about your situation -- but here's info about panic attacks: http://www.Mayoclinic.Com/health/panic-attacks/ds00338/dsection=symptoms.