Exercise and diet with A-Fib

I'm 52 and still walk 6 or 7 times a week. The drugs I'm on make it a little harder to exercise but my Dr still wants me exercise. I've had a flutter ablation but am still having episodes. I'm in the process of losing 60# so I can have the Afib ablation. It's hard but not impossible. My main block is my anxiety about having episodes.