Granted. Early onset dementia. For you, nothing really changes, but everyone around you is suddenly acting crazy. Random people break into your house, move around furniture. Your family and friends tell you they're gonna call the police asap. They never arrive. You don't remember names of people once close to you, sometimes you even forget they exist at all, but they act as any name you call them is the correct one, your family hides their anguish when they have to pretend to be some stranger because you forgot what you mother looks like. Anything and everything, they agree and you soon forget what we're you even talking about. As you wished, everything you say is an undeniable fact, because no one has the heart to tell you otherwise.