The victim fears that others will not believe the report
Explanation:
It is a big deal when someone reports sexual harassment. When a student is sexually harassed they feel melancholy. Sometimes the harasser is known as a "good person" and people won't believe that they would do anything to hurt the victim. That is why the victim might fear others not believing them.
That would be the artery in your neck (carotid artery) because it's the artery that will have the strongest beat as it's closer to the surface of the skin.