I also spent much of last week feeling like my mind was in a fog, which was disconcerting and unpleasant, but the fog seems to be lifting now, so that's good.
Another thing that's taking up my time, though, is fanfiction. And not just reading stories, which I already do extensively and is nothing new to me, but for the first time in ages I have a proper idea for writing one. At first I planned to write it just for me and not share it anywhere, but I'm now wondering if I might put it online. That does make it harder to write though, cos it means I feel self-conscious about the work and spend ages on research and word-choice rather than just writing whatever I like knowing no-one else will ever see it.