Hi @HeatherT and welcome to the forum. Your husband can get a whole lot better, it just takes time and a lot of hard work with his rehabilition exercises.
I do know that @mrfrederickson on here is experiencing similar movements both in his stroke arm and leg when doing things like yawning or rubbing his ear. We were just discussing that on another post. I’ve supplied the link to it below.
As your husband is experiencing these movements early on in his recovery, you should both look at it as a positive, there is connectivity and signals are getting through or at least starting to. So stay positive, don’t give on the rehab and rest or change activity when the brain tells you to…hence fatigue.
Lorraine