Pulmonary hypertension is a serious disease, and without proper care it can be deadly. It is imperative that the PH patient seek a physician who specializes in treating pulmonary hypertension.
Often these doctors are associated with teaching hospitals where PH research is on-going. Many patients travel hundreds of miles (I drive to Denver, CO which is over 400 miles, one way) for their appointments with their PH doctors. Since these doctors are also researchers and professors, their schedules are full: it is typical to have a 3 - 4 month wait for the initial appointment.
Doctors can be found on the Pulmonary Hypertension Association and the PH Central websites.