Well, it could be medication, yes.
Or it could be menopause-- if my memory serves me right, you are nearing that time?? there are many articles on how women going through menopause have all kinds of memory struggles.
It could be a low thyroid too-- that can cause memory problems.... there are just so so many things it could be.

I think it's a good idea you are journaling about it and can take it in to the doctors when you go.

wishing you the best

fins