I am surprised your doctor didn't just add the Calcium Channel Blocker... and maybe reduce the Beta Blocker. That is the process I've gone through.
My goal is only to reduce my AFib driven high heart rate.
BB and CCB are very different medications, but both tend to lower the workload on the heart.l
I will not argue with your doctor but if it were me I'd ask: "how about moving to 50 mg (slow release?) Metoprilol and adding the CCB?"