I've had the electric shock you describe, but it was in my wrist - I could touch it, and a shock would run up my arm.

For a while, both my right arm and my right leg were numb-feeling, but i could still use them. (Felt like they'd been novocained.) It's gotten a little better, but my right arm is still weak.

Now I've got spasticity in my right arm and leg, so when I use my right arm for anything strenuous, it carps out and then cramps up! At least it's just my arm.

As for what to do... I just waited it out! I learned to use my left hand for most things, as the right is unpredictable. (Except for writing - haven't figured out how to use my left hand for that yet.)