The most horrible bit for me about these is that, although mine occur individually they are completely random and feel like a mini-shock. This sensation, and the whole business of waiting for the 'next one' keeps me on edge most of the time. If only there was some way of becoming de-sensitised to their onset, I would feel so much more relaxed, and grateful. I have had them on and off since 1973 (!!!) although it's only recently that they have been manifesting in this insidious way.