Diokophobia

Diokophobia (Pronounced DEE-Oh-Koh POH-Bee-Uh) is the irrational and extreme fear of being chased. It is the action of being chased by someone or something that frightens you, perhaps to the point of freezing, curling up defensively, or lashing out (verbally or physically). Diokophobia is not the fear of the thing chasing you, or what it will do when it catches up, it is the fear of the chase itself.
 * Source https://www.urbandictionary.com/define.php?term=Diokophobia