Hi @KateM,
AC is a bit nasty to say the least. For the first two rounds my crash day was day 4.and 5 then got better. i didn't do anything too special apart from drink a lot more water than I normally do. I did find it cumulative and the fourth round a lot more difficult to get over but I think some of that was my fault for not taking it easy.
I found planning projects helped to keep my mind busy and not think about things too much.
If you feel like walking do it, if you feel like mowing the lawn do it, if you feel like watching netflix, drinking wine and eating tim tams that's fine too.
Just do what you need to get through and out the other side.
All the best
xoxoxoxo