Mom has undiagnosed dementia - NP believes it is vascular dementia, visiting nurse thinks her behavior is more like alzheimers, PCP thinks it could be latent bipolar disease since it happened pretty quickly. In any case, there is some psychosis going on for some reason. We are in the process of getting a psych referral but not sure that Mom will cooperate. Well last night was the worst yet. Mom had a pretty good day. I actually carried on conversations with her most of the day. Then something snapped and she didnt know who I was. This has happened before where she thinks I and my sisters all have imposters. Mom went into the hall in her apartment building and starting banging the walls and screaming to call the police. Two neighbors came out and tried to calm her. I also called a friend and asked her to come over. Mom recognized and responded to all three of them but insisted she had no idea who I was and I was certainly not her daughter. Can anyone shed light on how she can relate/respond to mere acquaintances but doesn't know me? I have been by her side and helping her for the last 10 years. One minute it's what would I do without you and the next she claims I'm not her daughter. We got her settled and into bed last night. This morning she has not uttered a single word and just stares into space it glares at me. I'm at my wits end.