I am periodically experiencing a pain in my high stomach, low chest area and I can feel it in my back between my shoulder blades also. It feels like someone has one hand in front and one hand in back and is pushing together. I feel a tad dizzy but not a lot. Also, sometimes happening at the same time but sometimes not, my heart feels like it is racing. I can actually feel my heartbeat in my neck, my head, and my ears when this happens.