"Demons" in that context is basically a metaphor for "something bad that is hurting me". So? When one finds out some more details about what that something bad is, one uses different words to describe it. All words are just symbols. He who uses more complex or modern symbols may rest under the illusion that he knows all there is to know about the matter, but he is probably wrong about that. ;-)

You can't fully grasp reality with words, only with direct experience.

Unfortunately, words are all we've got to communicate with on this forum...