There’s a feeling you get when your stomach is getting ready to empty its contents, either from either end. You begin to feel flushed. You touch your hand to your forehead and feel the heat rising off the surface of the skin. Your palm reacts by going cold and clammy and you experience that unsettling feeling of being hot and cold at the same time. The ground begins to shift beneath your feet and your reach out for something sturdy to lean onto.