That's an interesting concept, hangingbasket, and I agree with you. While not always driven exclusively by feelings of guilt, anxiety disorders, including HA, can for sure come about through faulty thinking or unresolved feelings/issues from our past (though this isn't always the case, as with msgb98, who seems to just have a lot of external stress going on).
Since anxiety and its symptoms seem to come "out of the blue," oftentimes we think it's something that just kind of "happens" to us. But it's important to see how our own thought processes contribute to our own situation. We love to say things like, "why is this happening to me?," to see anxiety as this outside force, when in reality, anxiety is not this uncontrollable thing that has chosen to descend upon us—it's actually a natural byproduct of years and years of undealt-with guilt, or shame, or poor stress management, or bad boundaries, or taking on responsibilities that aren't ours to take on, or avoidance behaviors—whatever it is, it eventually catches up to us.
I harp on therapy, but this is why—if taking on guilt (for instance) is what's normal to you after years and years of experience, how are you supposed to know how to change your mindset by yourself (or do so automatically)? It's a process that takes time and effort and, usually, some professional guidance. But more than that, it takes a willingness to face those bad, maybe embarrassing, parts or ourselves and to work through them and get past them. That involves letting go of old, perhaps comfortable thought patterns and developing new ones, which of course raises our fears of the unknown and losing control—two more things we hypos hate.
Anyway, interesting point, and something to which I'm sure most of us can relate.