i just had my one and hopefully only anxiety attack not to long ago and let me tell you something it was one of the craziest things that ever happened to me. first my mouth started to feel numb and tingly, then my arms. before i know it, im on the ground trying to breath normally and not pass out. it felt like i had a constant head rush, my arms didn't return to normal for a half hour after it subsided. must of been all the hyperventilating