I know this is going to sound too cliche and a bit annoying, but can you rule out 'stress' as the cause of these strange hand jerks? I am only mentioning it because you started your post saying things have been hectic. I can only talk from personal experience, but often stress (damn, I do hate that word, because it is used way too often, for everything) can creep up on you. It could be a way for your body to say 'enough, need to rest now'.
It could also be the meds. I know when I was on the classic fibro meds, my hands and feet were acting up real strangem jerking, restless, shaking. Once I stopped taking them, I was back to normal.
Or it could simply be fibro - I blame fibro for my weird hand shakes and jerks. Beginning of the year my hands started going weird again. It was not an every day, all day thing. But it made my life really difficult. (I could not even type in my pin code at the cashier's - a place where I am already quite anxious. Then I tried paying in cash, but that was even worse with cash flying all over the place because my hands were acting up - so for a time I stopped going to stores all together!) Combined with numbness/tingling in my feet, I was referred to a neurologist, got a brain MRI, it came back clear, and the doctor simply said it was 'stress' and that I should see a shrink. (!!!)
Now it comes and goes - as with most things, I simply have to accept it, otherwise the anxiety gets to me.
But in your case, it could really be the nerves in your wrists - our hands are very fragile parts of our bodies, and we depend on them all the time, so I would definitely have that checked out, if I were you.
I am also curious whether anyone else here has the same problem as well. Is it fibro, or is it something else? The never-ending question!
All the best!