I've recently been getting more of these recently I think from having to move house, even though I've found a place I still seem to be getting them and they seem to be between dinner and going to bed mostly. I don't want to go back on xanax though I have been taking it from time to time when it's too much. I think it's like my body is all tensed up during the day and then at night when it's time to unwind my body freaks out... I hate it, it feels like I'm going to have a heart attack.. can't get comfortable in any position to make it go away and just have to squirm until it passes. >:(