Erin -- sorry you were having such a rough time in the middle of the night. Steroids can increase your anxiety. I have had that crushing feeling around the left side of my rib cage for the past three years. I assume I have permanent damage. At times it is just annoying and at other times, it is horrible. But unfortunately, it is always there. For some reason when I lay down, it bothers me less. Hope you get some relief with IVSM.