From the back cover:

"Eleanor Druse has always been interested in the paranormal, but her fascination intensifies after she has a near-death experience at Kingdom Hospital while visiting a childhood friend who has just attempted suicide. Eleanor is treated for a mysterious condition at Boston General Hospital in Massachusetts, where she falls under the care of her nemesis, a surgeon named Stegman, who doesn't believe in Eleanor's psychic gifts."

I saw the TV mini-series first, and had to find the book. It's all by Stephen King.