Did you taper off of your beta blocker before the procedure or was it a sudden stop. How long before the procedure did you stop completely?
I have been taking atenolol for about 10 years now and I can tell my heart is dependent on it because if I skip a dose I get really anxious, my heart rate goes up and I get a lot of palpitations. If I go through with the ablation procedure, I am a bit worried about the effect on my heart of not taking it anymore.