Hi! I am having the same problem and it bothers me so much! I too have anxiety and am on 1mg Xanxax XR daily but can still feel my heart beating all the time...it drives me insane. There are times when I will be just sitting here completely relaxed and my heart will start beating fast or when I just do light housework, my heart will race. I am 34 yrs old and have never had any medical problems aside from the anxiety/panic attacks. I am constantly worried about my health though, I always think the worse! I have had EKG's, xray's, halter monitor test and blood test done and all come out normal. I haven't been to a cardiologist yet though, I really am considering going just to put my mind at ease! I have gone to 3 different general docs and they all say anxiety is causeing it. My husband does have alot of medical issues, he is depressed often due to chronic pain so I am constantly worried about him...it's hard not to worry! I never ever have any energy to do anything, when I do exercise, my heart will start beating fast (which is normal of course!!) but I start getting short of breath and worried because I can feel my heart beating! I hate feeling this way all the time, it is controling me...I'm too scared to go anywhere by myself becaues of this! I just want my life back! I know you posted this a while back but I was hoping you would get my comment and tell me how you are doing and to see if you are still having this problem. Thanks!