I have been taking bystolic for several months to control anxiety and panic attacks/heart arrhythmias related to Mitral Valve Prolapse. My blood pressure seems to be OK, but my heart rate has steadily decreased over time to 47 bpm. My primary care physician is concerned, but my cardiologist is not. I am feeling very tired and fatigued, but also take zoloft and Klonopin. Should I get a second opinion from a different cardiologist? I am 53 years old and female.