The Forgotten(2004)

Everything you've experienced, everything you've known... never happened.

Telly Paretta is a grieving mother struggling to cope with the loss of her 9-year-old son. She is stunned when her psychiatrist reveals that she has created nine years of memories about a son she never had. But when she remembers a man who had a similar experience, Telly embarks on a search to prove her son's existence, and her sanity.