A pathological condition whereby the sufferer fears those who fear pathologically.
Remembering that his friend suffered from an acute case of phobophobia, Timothy abstained from mentioning that hiding in Grandma's trunk made him feel claustrophobic.
Being afraid of being afraid.
This is something you can really get worked up with.
A: Don't scare him. He has phobophobia.
B: AAAAH! That was scary .... AAAAAAAAAAAAAAAAAAH!