Hi , does anyone have any experience of pwpsp having shaking episodes? Dad starts to shake furiously hands, arms, legs everything and he grips either our hands or his own and clenches his teeth. He looks really frightened when this happens (lasts probably about 30seconds) and breaks out in to a cold sweat. It happened a while back for a few days and now its happening again. What on earth could it be and how can we help?