Fiction by Liane Moriarty.
This is a story about a woman (named Alice, of course) who forgets the last ten years of her life. She hits her head in 2008 and wakes up thinking it's 1998. This creates a problem, of course. 29-year-old Alice was pregnant with her first baby and madly in love with her husband; 39-year-old Alice has three kids, and is getting a divorce.
I'm not sure how medically possible amnesia this specific is, but I was willing to suspend disbelief. It's an interesting idea to explore: How much does life change over a long period of years? Are you still the same person you were when you were younger? Would the younger version of yourself even understand the way that you are now?
It's a good book.
I also read by this author: The Last Anniversary, The Husband's Secret