This is a rare phobia among phobias that I suffered from as a child, but overcame.
It means “fear of infinity” but also “fear of endlessness” or “fear of endless consciousness” or also, “fear of endless space”. To truly understand this phobia, you have to have experienced it.
My message is that it can be lessened to a great degree, or cured—and this important for a person who has it to understand.
Because of my personal experience and sympathy with those who suffer from it, I am working on a site dedicated to resolving this painful phobia. Contact me if you are affected by this.