Oh man, that happens to me all the time. It's pretty scary. Truthfully, I only deal with it by dealing with it.. if that makes sense. I just try to calm down and zone out of everything, but it doesn't usually work. Sometimes it lasts a couple minutes and other times, several hours. I never thought it could be because of my anxiety though.. I just assumed there was something wrong physically. So if anxiety does have that effect on a lot of people, then maybe it is psychological. What do you do when it happens?