Yeah, I think a lot of people with anxiety have this, especially if they have panic attacks as you are on constant alert for the next symptom. I think this is what makes anxiety worse to be honest and because we're anxious about what we notice (which may be a perfectly normal sensation that would otherwise go undetected) we are anxious and therefore notice more anxiety symptoms. Have you tried CBT? It's what I'm doing at the moment. I can't say it's helped yet but I've certainly learnt a lot about my anxiety.