I recently had been having panic attacks every night since a surgery I had, and the xanax wasn't working as well for them, so the doctor put me on Atenolol to keep my heart from racing, and said after a while the panic attacks would stop and I could go off it. I've never had to be on anything for them constantly, so I didn't want to now either. Now each night when I would normally get a panic attack I feel a heavy feeling in my chest. Kind of like my heart is worn out, or just heavy for lack of better wording. Is this normal. I took it one other time about 10 years ago, when I had a constant panic attack for 5 days, and it actually did stop them back then. But I don't remember having this heavy heart feeling. And can having too many panic attacks or ones that last a long time wear out your heart at all?? I know panic attacks are all about worrying, so I'm probably just worrying too much. I was just wondering if anyone else knows or has the same thing. Stacy