I think my mother has Dementia. She is also legally blind. This combination is tough but she will be very bad for a while then have a week or two of clarity. It does not seem to get any better or worse. She is very stubborn a has always been controlling and not very nice to me. She lives next door and I have her care mostly under control. I just wonder if there is any way without medical testing to know what it really is? She is 87, but honestly....I might go before her!