I get those muscles spasms too. I've explained them to my neurologist and the answer I got was the nerves were trying to fire up on their own. A typical symptom of RSD. If mine get worse she is going to prescribe muscle relaxers and maybe that's the course of action that your hubby needs. The ER won't do much but his neurologist might.
My left leg and foot are constantly feeling like they're falling asleep. Sometimes just tingling then other times feeling like they're in a press being squeezed. When both my arm and leg are in the press together I've cried from the pain being unbearable.
I have to stay indoors so the weather or wind won't bring on a flare up.
This monster sucks the big wazoo...