Type x aracniphobia
Type x aracniphobia is one rare case of aracniphobia and 1 person out of 10,000,000 people get this type every year. Here is an explanation of what happens if you have type x aracniphobia : When suddenly approached by a six or more legged creature (encluding flys or other flying insects) you generally get an erge to kill whatever the creature maby be but your body is imobilized and won't let you approach it any further.
Adding to that subject you may feel your eyes not being able to move the creature unless there are more than one or to look behind you if you are moving away slightly (encluding fetching a large heavy object to kill it with).
In the mean of time, scientists are currently observing the type x aracniphobia and like all types there is no cure yet.