I have another suggestion, but it is definitely not a fantasy book. However, the writing is superb and the subject matter is haunting.
It's called Still Alice, by Lisa Genova. It is about a woman who, at age 50 I believe, is diagnosed with Alzheimer's. The book is written in her voice.
It is not an easy read but I think there is so much for us to talk about. I will go to amazon and add a better accounting of this book:
"Still Alice is a compelling debut novel about a 50-year-old woman's sudden descent into early onset Alzheimer's disease, written by first-time author Lisa Genova, who holds a Ph. D in neuroscience from Harvard University.
Alice Howland, happily married with three grown children and a house on the Cape, is a celebrated Harvard professor at the height of her career when she notices a forgetfulness creeping into her life. As confusion starts to cloud her thinking and her memory begins to fail her, she receives a devastating diagnosis: early onset Alzheimer's disease. Fiercely independent, Alice struggles to maintain her lifestyle and live in the moment, even as her sense of self is being stripped away. In turns heartbreaking, inspiring and terrifying, Still Alice captures in remarkable detail what's it's like to literally lose your mind..."
This book received 630 reviews, and a whopping 491 of them gave the book 5 stars, the highest mark possible.