Hi. I had a cardiac ablation done on 2/27 for SVT, and I'm still having issues. Frankly, I don't know whether I'm experiencing panic attacks or continued SVTs. Today, for example, my rate has been at 160+ for two hours. Nothing like the 200+ I had prior to the ablation, but it's unnerving and - at times - debilitating, because it also makes me light-headed. I went to the ER about a week ago, because I felt on the verge of passing out for several hours.... couldn't shake it. I took a Xanax to see if it were merely a panic attack. I've never had an history of panic attacks, but the symptoms are similar.... pain in my chest, shortness of breath, palpitations, rapid heart rate, etc. The Xanax did nothing. At the ER, my tests were all fine. The only thing interesting (to me - but not to them) was that my resting rate would fluctuate between 68 and 135 without any change in position, activity, stress, thoughts, etc. My blood pressure ranged from 90/50 to 128/82. Up and down. Maybe that's normal. I don't know. Went for a follow up with the doc... now wearing a monitor, but - the thing is - those are a PITA. I work full time, and I can't afford for the darned thing to go off when I am with a client... and it's so sensitive to touch that it does start at the most inopportune times. Anyway, the doc also suggested that I start taking Xanax (.5 mg) 3 times per day. Well, I started doing that last week, and I've had fewer attacks, but I'm feeling morbidly depressed.... like a chemical imbalance. I have always had a lot of stress in my life, but - I have to admit - it's really peaking now.... and I feel like I'm between a rock and a hard place. The doc can't see anything wrong with my heart... other than the rapid rate. But I can't help but feel that 150+ at least every other day isn't normal. But is it SVT or is it panic disorder? If I take Xanax, it helps a bit with the attacks but I can't stand feeling this overwhelming sense of hopelessness. And the Xanax doesn't completely control it, so maybe it isn't panic disorder. The doc said I could double the dosage to two pills three times per day, but I'm scared to death of the effect that will have on me mentally. I've had depression in my life, but nothing like this.... and if it gets worse - if the Xanax is causing this - I can't handle it. I'm getting so frustrated, worried and depressed because I have to be healthy and productive - especially at this time of my life.... and here I am feeling as if nothing is working. I can't live like this. I've always been healthy, energetic and productive... and very good at dealing with stress. Hell, I don't know what's wrong with me; I need to fix it, though. I feel as if I'm at a breaking point and don't know where to turn.