Most women do make a full recovery even after very severe PE or HELLP.
I had very severe PE (BP 250/120, pulmonary oedema, class I HELLP etc), though I was going to die (as well as my baby), but made a complete recovery after a couple of weeks with no lingering problems. It is mostly an acute illness. The thing to bear in mind is that it "uncovers" your risk of hypertension and Cardiovascular disease in later life. The rapid and full recovery made it easier for me to contemplate trying again (although I am also very anxious).
I've had miscarriages too, but am in my late 30s so not hugely surprising.