AFIB and Running

Hi my doc sent me to a cardiologist because I was having trouble with meds to control blood pressure. He discovered Afib and put me on Metoprolol and Eliquis. and he referred me to a PC team I see them next week. After I got the diagnosis I emailed him and asked him if it is ok to run ( I am 74 and run 4 to 7 miles 3X a week at a 12:30 pace average hart rate 148BPM. I have not received a reply, I call and ask the nurse and she did not have a satisfactory answer. does anyone have any information on doing high intensity exercise with afib?