Sinister left hand!

My left hand ran amok today. After a brief warm up and review of some of the position suggestions I had from Major Beale and John, we started working on the circle that spirals in and spirals out. This was ok going to the left, but when we tried going to the right (clockwise), things fell apart. It took a while to figure out where the source of the problem was (for me), but it ended up being my left hand, which refused to obey me. We had to go way, way down - to a halt - and then very slowly and deliberately work our way back up to the spiral circle in and out at the trot. It was infuriating that I couldn't get my hand to obey me, and that it threw off the whole exercise so dramatically. It was also good to get it isolated - and fixed - so that I can work on that on my own. The list of things I am working on, though, has gone from "proficient but polishing" to "everything" and so I am wrestling a bit with overthinking every single thing and not being able to keep them all in my head. Charlie was moving nice (once we got going) and my seat at the canter felt really improved, but that hand! Good lord!