John and Mycroft make Sherlock believe that he and John have never met before (gaslighting)

[Kika Merlino]

Hi! This is first time posting here, so excuse any errors I may have. But I'm going crazy trying to find a post-Fall fic in which Sherlock wakes up in the hospital and is told by Mycroft that John is only his neighbour, and that Sherlock is not in fact a detective but just delusional. Sherlock insists that Mycroft must be lying so he has Mycroft bring John and John confirms that he really doesn't know Sherlock, and Sherlock is really shocked, because the John he remembers wouldn't lie to him, so he concludes that he (Sherlock) must indeed be losing it. As it turns out, it's all a plan by Mycroft who is just trying to keep Sherlock safe after the fall while he hunts down Moriarty and has kinda forced John to play along. There's also a cat that Sherlock has as a pet, and he is allergic to cats so he doesn't really understand why he has one.
Anyone has any idea what the fic is? I can't believe I lost it. Thanks!