@frande, glad to see you here to commune with us on a-fib and related heart issues. To answer the question from @colleenyoung, I have NOT experienced nausea, and after reading everything I could find on a-fib, I think I don't have nausea because I don't take the medications known to cause it. One reason is these medications are likely to be administered AFTER cardioversion is performed -- in other words to stabilize the heart rate after it is "reset." When my a-fib was diagnosed two years ago, I found a Mayo Clinic article that had been published in 2012. Fortunately, that was updated this year with the latest information. Here's the link: http://www.mayoclinic.org/diseases-conditions/atrial-fibrillation/symptoms-causes/dxc-20164936.
Does that background information suggest that your a-fib is causing nausea? Or as with the period before your last surgery, is another problem causing the nausea? Hyperthyroid symptoms, for example. I would want my doctor to answer these questions to my satisfaction, focusing specifically on the nausea, which can be caused by so many different things.