Dear roger,
There is a saying in medicine that when one hears hoofbeats look for horses first (common things) and not zebras (rare - at least in Boston where most medical sayings originated). Asthma is a horse and primary pulmonary hypertension is a zebra. Sure it could be either asthma or PPH but the first step is to rule out asthma and a lot of other things that could be causing shortness of breath. A echocardiogram can give valuable clues as to the presence of PPH but the gold standard is a right heart cath. The pulmonologist should be able to give you more info about the various tests that can be done to get to the root of your symptoms and hopefully give you some relief.