Jenny I can tell you what to do cause I've been threw the same thing. You need to get checked for seizures. Thats how I started by my arms and legs just jerking out of control, no matter what I did my arms would just fly out and man when your trying to control your muscles when they don't want to listen hurts.
It is no big deal when your tested you just lay there with wires hooked to your head, you look like you have a new age weird hairdo.
Talk to your neuro, thats what I did.
Have they checked for MS?