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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.
Anger can actually come from more than one cause. Interestingly, however, the anger itself may be a cause of anxiety on its own. Many people experience profound anxiety as a result of their anger episodes, because of their inability to control that anger. If you haven't taken my 7 minute anxiety test yet, take it now.