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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 causes your mind to focus on the issues that are bothering you the most, and so when your stomach is bothering you because of anxiety, anxiety will cause that effect to be amplified. If you haven't done so yet, take the 7 minute anxiety test I developed to give better understand your anxiety symptoms.