Many people recover and get better or they find the right combination of drugs and doctors to feel as normal as they can . You are young so you have youth on your side.
As far as your BP changes and having pots ,only a doctor can tell you that . I'm no doctor but as far as my experience with pots goes , it sounds like you have pots if your hr is going to 150 when you are standing . Mine did the same thing . Some have low BP and some have high BP ,depends on the type you have . Have you had any autonomic testing or a tilt test done ?