This has happened to me too when I have a mixed episode. For me events start blurring together (or don't come back at all) when normally I have no problem focusing or remembering. Last time I left my sons diaper bag with all his favorite stuffed animals in it right in the top of the cart at Walmart but it took me hours to figure that out because in my mind I really couldn't even remember taking the cart to the return..! I've never left anything at Walmart. I get so frustrated, too. I'm only on lithium and have no therapist currently so I just assumed it was normal. I would love to find out if there is anything that would help!