Hi there. I'm really sorry that you have gotten this diagnosis. I'm sure that is scary and we start to think about what this really means. Were you having symptoms? Do you get annual testing and this showed up then? I think PH is often diagnosed a bit later as it is hard to catch early. There are stages to PH, from 1 to 5. Do you have symptoms and then if you do, are they when exerting, also when resting, etc.
There are medications that help! While there is no cure, medications help with symptoms if you have them and prolong your life. Vasodilators, another type that relaxes pulmonary arteries and lowers the pressure, another that widens blood vessels alled endothelin receptor antagonists reverse the effect of a substance in the walls of blood vessels that causes them to narrow, erectile dysfunction meds (believe it or not which started out as cardiac medications) which help to increase blood flow through the lungs, calcium channel blockers, blood thinners, digoxin, diuretics and oxygen therapy.
That's a super SUPER long list. While you may not be able to cure your PH, think in terms of so much these days to manage it. To hold it where it is at.
It probably was there but they couldn't yet detect it for why it seems like it developed so quickly. What lifestyle guidelines did your doctor give you?