Does this ever happen to you? You've been taking care of something that requires your attention and when you start doing something else that needs to be taken care of, something similar like a phonecall for example, but totally different context and people, you suddenly become unsure who you are talking to and what the topic is.
This happened to me today, I was texting at work after I had taken care of some personal stuff on the phone, and then I thought I'm sending it to a family member and it's my mobile phone although it wasn't. I just sat there staring at the mobile trying to figure out why I'm texting work stuff to my family, and I didn't understand the situation for a minute and why I was still at work. I was planning to leave earlier, there were several hours left, but I felt that I had forgotten to leave in time. Strange double exposure feeling.
There have been other times. Once I completely forgot who told me certain important and highly personal things and started to talk about them with the wrong person, and I was so convinced it was him and not the other person.
It's no fun.
Once again I'm fearing that my memory is letting me down.