Omg. You have just described me..When I am not in afib ( or at least I don't feel it) I can take on the world. But as soon as I feel it again I go into this state of fear , panic and anxiety. I just can't relax myself. However, I have started some Cranio Sacral Therapy which I must admit does relax me. I practitioner discuss the vagus nerve with me and gave me a few little exercises to do to sooth it. Early days yet but I certainly am going to keep at it. It all makes perfect sense to me. I find great comfort in knowing that I am not on my own and that lots of people feel as I do.