A few years ago, when I came off of Zoloft, I had them for about 2 months. It was a very unpleasant sensation, and I was so relieved once they were gone, I had been so afraid I had some damage to nervous system or something from the med.
I did tell my GP (the one who prescribed it) about the zaps when they first started, he told me to give it awhile, gladly, they left me 2 months after discontinuing the Zoloft.
It's always a good idea to check with your doc, just to be safe and/or rule out anything else.