Hi, Is it possible you are having withdrawal symptoms from something. Are you on meds that you have suddenly stopped taking. I know that when I miss my antidepressants that I get what you described. It feels almost like an electric shock in the head and body jolting .
If it is not meds related or any other kind of drug you should see your doctor.
It seems to me you need to discuss at least with a Primary Care Doctor...
You've told so little it would be hard to "guess", which has little value anyway. But be honest with yourself and your doctor: what have you been doing, taking, eating, smoking.... stuff that affects your health.