I get the occasional fasciculations when I'm really stressed.

A few years ago we had terrible flooding and other situations happening where I live and I had them everywhere. It was awfully worrying. I could even feel them internally in my abdomen. mrsD gave me lots of great advice at the time and I definitely noticed a difference with taking a better magnesium supplement and they subsided.

If they continue and you're worried, please mention to your doctor.