Has anyone ever fixated on a certain physical symptom they experience with anxiety or panic? I have fixated on my heart beat, I check it often for whatever reason. When I'm active it feels like it is beating faster and harder than it should. Yes of course your heart rate is going to increase by walking, lifting, working, etc. But now when it does I fixate on it and feel like something isn't right. This is a newer symptom for me, but it's been going on for a few months now.