It would be nice to have another reading now. It's possible it's come down somewhat now that you're home and presumably more relaxed. So probably no need to be afraid tonight, but do have it checked out tomorrow. The silent killer aspect happens over time, as I said, if left untreated. One way or another, it does need to come down for the long term.
When I was first diagnosed, my OB/GYN's nurse said about the same type of thing that the OP Dr said to her. Only she went into detail about a friend that had died. Mine was about 140/90 at the time. She terrified me so much that now I have a total phobia about the blood pressure cuff. Mine goes up when I see them taking it on my DD 11 during her physicals. I stated going to a cardiologist about 2 years ago just to make sure everything stays under control. I had a stress test, and they were actually kind of laughing, but not in a bad way, because they said it was the worst case of white coat syndrome that they had ever seen. They could tell from the test and my records what it was. They gave me some sort of pill to bring it down and told DH not to worry, by the time I got out to the car, I could barely walk and that night my BP was literally 85/60. It was fine the next day.
My cardiologist said that she should have NEVER, said this. It twas actually my first panic attack, I had just gotten over a breast cancer scare and I had 3 young kids at home. Now some 9 years later, I am almost panic attack free, but the BP won't come down whlle at the Dr's office. I am so tired of having to explain this to every Dr I see.