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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.
Anxiety can also have a severe effect on your hormones and damage your organs, and your skin is your body's largest organ, so the idea that anxiety can lead to scalp itch is not an unusual one. If you haven't already, take the free anxiety test I developed to get a snapshot on your anxiety and its potential causes.