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This small nucleus contains almost half of all the brain neurons that use norepinephrine as a neurotransmitter. The locus coeruleus also projects its axons to those parts of the brain that may be associated with panic disorders (the amygdala, hippocampus, septum, cortex, brainstem, reticular formation, etc). Stimulating an animal's locus coeruleus, like stimulating its amygdala, produces anxiety behaviours.
Think of anxiety like a disease - it wants you to experience anxiety more, so it brings the thought back into your mind to cause you that anxiety. Anxiety also changes the way your brain works so that it's harder to have positive thoughts, which also pushes these unwanted thoughts back into your mind.