Pulmonary hypertension is high blood pressure in the pulmonary arteries. These are the blood vessels that bring blood to the lung from the heart. Normal pulmonary artery pressure is 25/15 mm Hg. The mean value ranges from 12 to 16 mm Hg. So your pulmonary artery (PA) pressure of 81 is high, without a doubt.
Pulmonary embolism is the most likely cause of your high PA pressure. The following question must be answered -- Is your worsening pulmonary hypertension the result of the effect of the pulmonary emboli you have had in the past or the result of new pulmonary emboli? If it is due to new pulmonary emboli, you must be treated so that no more pulmonary emboli develop.
There are medicines that will bring down your PA pressure. In addition surgery, called atrial septostomy, may be an option. You should consider being evaluated at Rush University Medical Center in Chicago to see what they would suggest to bring down your PA pressure. People with pulmonary hypertension are also evaluated at the University of California at San Diego and the University of Colorado.