Hey @KatieT,
I sometimes have the same issue, but it is the Tamoxifen doing it. I have a lot of trouble with word recollection. Often sentences come out backwards. At work the other day I had to write a Doctors name on the whiteboard and wrote it completely backwards. Gave the nurses a bit of a laugh. Multi tasking at work is sometimes difficult if it's really busy and my brain just fogs over and I can't think. Right now I have an alarm set to remember to put the roast in for dinner.!
I know this is the Tamoxifen because I have done several trials off it and it goes away. Are you on Hormone Therapy?