hey mark,
i don't realy use the boards much anymore these days, but when i saw your topic title i thought i should reply. at the start of my twitching, i had a spell with jolts that really freaked me out too. i had them in my arms and legs, and when i was drifting off to sleep at night my whole body would sometimes jolt. they can be really scary but i learned quickly that they're perfectly normal and probably a lot more common than you think - my gp even said that she too sometimes jerks and jolts as she lies in bed and they annoy the hell out of her! just remember that they are absolutely nothing to fret over, that your just in the same (very, very big) boat as all of us, and they'll eventualy calm down. once your not anxious about them anymore, they'll disappear, honest.
have a great day,
mart.