I Am Currently Taking Simvastatin 20mg, Fenofibrate 160mg, And Metoprolol

I am currently taking Simvastatin 20mg, Fenofibrate 160mg, and Metoprolol 25mg, I have been taking these meds for many years, and I am starting to have certain conditions that I haven't had before. One symptom is very hard heart beat the other is fast irregular heart beat. Could this be caused by a prolonged dosage of these meds or could these meds be reacting to each other? I have been to my family doctor and to my heart specialist with this problem before but they do not seem to be able to fix. What should I tell them on my next visit?