I'm currenetly taking 25mg daily of Metoprolol ER. This works well to control my tachy....but, has bad side effects of anxiety, restlessness and agitation. I lookd up Bystolic..and it has none of these type side effects listed. I was going to ask my doctor to change to Bystolic. Has anyone here had any success in changing over to Bystolic from Metoprolol ?