So from my understanding. Anxious people are so anxious that they overload the part of the brain that typical deals with anxiety so the brain routes it to another part of the brain to deal with it and that part of the brain isn't what you want dealing with it so it cause problems. So the key is too limit overloading the part of the brain that deals with anxiety, which probably means doing things you are fearing to do…
In a sense, anxiety is like a malignant cancer? That explains a lot.