In the morning I take flecaine for AF 100mg and have been

Hello, in the morning I take flecaine for AF 100mg and have been prescribed Atenolol 25mg to take in the evening. It's because occasionally I have some very rapid heart beat in the morning, no dizziness or breathlessness. I have had 5 mild AF episodes in the last 6 months. I also have a 'not serioius' aneurysm in the bottom chambers, no break through and looking at the screen the wall bulges into the left chamber, if that makes sense. I'm just interested why I have been prescribed atenolol. Thanks for your help
JA: How long have you been using Atenolol? Has it helped at all?
Customer: Actually not taken it yet as I wanted to know about the reason for taking it and if if has any contra effects with flecaine
JA: Got it. Have you seen a doctor about the aneurysm?
Customer: Yes seen a cardiologist, and seen it on the screen. He said it was age related perhaps, there is no breakthrough.
JA: Thank you so much for your time. Finally, is there anything else in your medical history you think the Doctor should know?
Customer: family history of AF in many varying degrees, from ablations to death. 1 Auntie 70 yo and a male cousin 54(unhealthy life style). All on my mothers, two of her sister and one brother with af. In the tests it seems I have everything normal, not swelling, no valve problem, I have never had high blood pressure, i dont smoke. I gave up drinking as that seemed to be a trigger for an af attack.