I have minor regurgitation and have had 2 bouts of a-fib.  I also have mitral valve prolapse.  Is a-fib common with the minor regurgitation and or mitral valve prolapse.  I have been under much stress also and overweight and out of shape.  Could this have caused my nervous system to over react as is what happens with mitral valve prolapse patients.
While weight gain has a potential to exacerbate, cause and worsen many diseases, disorders and symptoms of illness, its effect on Mitral Valve Prolapse and Regurgitation is poorly studied, and to my understanding, there is no evidence to support a strong connection; though each patient may respond to weight gain differently. I will say that STRESS causes a great many issues for the human body as well, including weight gain. With stress, Cardiac issues will often exacerbate/worsen and or present themselves after being previously undetected. Aphid and Mitral Prolapse and Regurgitation are connected, and yes stress may pay a part in this process. If you have been diagnosed as overweight or obese, I certainly recommend diet and or weight loss; as there are a great deal of cardiac benefits, other than prolapse, regurgitation and a-fib which can occur as a result. I wish you the best of luck.