Follow-Up: Had it too since childhood; on & off, mostly on; tends to intensify when very tired and/or have had coffee/chocolate late in the day (hence i'm trying to cut on this and similar stuff); level of stress seems to influence as well Healthy body vs healthy mind seems to ring a few bells!!! Yet with today's life-on-the-go it's pretty hard to stay relaxed through it all..! Finding one's balance between work-relaxation-diet-exercise =lifestyle, may be the go - but then again, it comes down to the individual; i don't expect a universal remedy for us all - but i'd love to wellcome it if it's out there hope this helps a little bit!