I didn't read The Haunting of Hill House until sometime early in the 1990's.
I lived in Georgetown in the late 70s about four houses down from the steps.
I get cassettes near Academy Award time of every movie that's made that thinks it has some kind of chance for a nomination - that's when I watch my movies
I tried to make every bit of it as creepy as I could. And I had the same response you do. I feel the same way. The hospital scenes, that procedure was so real.