What class of pulmonary hypertension do i have if it was caused by severe pulmonary hypertension?

It depends: The "class" of pulmonary hypertension typically refers to how much it affects your ability to carry out daily activities. Both nyha and who have classes of pulmonary hypertension. Class i=no symptoms with normal activity. Class iv=symptoms even at rest. "severe" pulmonary hypertension more typically refers to the height of pressure elevation.

Pulmonary hyperte: Pulmonary hypertension can be primary or secondary, from your question it isn't clear which kind you have or the cause. The severity also isn't clear from your info.