Several sources state that excessive fear of a certain occurrence can cause it to happen.

It is written (Iyov 3:25), “I was afraid and it happened. The matter that I was worried about came to me.” The Gemara (Brachos 60) states that this pasuk tells us that when a person is afraid, this can cause what he is afraid of to happen. ~ R’ Elimelech Biderman, Shlita