I am dealing with this at the moment. The cardiologists don't seem to care what's causing it. I am screaming that it's being caused by autonomic instability but it's falling on deaf ears. Who is the dysautonomia cardiac doctor you're seeing? I was in and out of the hospital this past month and now I'm on metoporol and flecanide. My hope is that it's temporary until I get this figured out. I am super autonomically unstable at the moment. I took a bath tonight and reacted to the hot water.