I found a story about a woman, Jill Price, whose memories don't fade. She's been tested by various researchers and they've concluded she has accurate recall of daily events back from the time she was 12. (She kept a daily journal all those years.)
She describes the memories as a split screen, and says that a dozen or so times a day, a memory will be triggered by a smell, a song, a sight, and she reexperiences that memory.
From the USA Today Article-
The constant onslaught of memories is both a curse and a blessing, Price says. Especially under stress, the good memories give her great comfort. "I have this warm, safe feeling, and I can get through anything." The dark side is that she recalls every bad decision, every insult and excruciating embarrassment. "Over the years, it has eaten me up."
Peaceful sleep is rare because memories assault her, she says. "It has kind of paralyzed my life."My MC, Lara, deals with the good and the bad of having a perfect memory. Can you imagine living this way? I thought I was making this stuff up.