Is this normal?

So I grew up on a farm where we had an electric fence to keep the bull from escaping because he was a jerk. I spent my childhood poking the fence with different objects to see if I'd get shocked. And I did get shocked quite a few times.

Now I am laying in bed and every now and then I feel a similar shocky feeling in my lower abdomen. Definently not as strong as the electric fence of course but its the only thing I can think of to describe this. It doesn't hurt really, just feels zappy. Has anyone else felt this?

Also the skin around my belly button feels numb... Is that normal?