I am worried about my mother. She is in her late 50s, almost 60s. She has been on a diet for ten years but recently her mood swings have gotten worse. She can be happy one moment and get angry the next, then fall into depression less than two hours. She is also forgetting things more. When I was younger, she forgot small things but this time she is forgeting events or placing them chronologically wrong. I don't know what to do. I have tried approaching or talking to her but she gets defensive and really p*ssed off. Any help or advice would be welcomed please.