"Hallucination" - hugs and relax, what follows is intended to validate and reasure.
about 10% of the population experience voices regularly, there's a society called "resonance" in the Netherlands for people who do. Their aim is to liberate the experience from being falsely medicalised, in the same way as being GLBT has been liberated from false medicalisation.
If people who are experiencing voices are wired up, the nerves and muscles involved in speaking out loud, give electrical impulses as though they were trying to move. The "hallucination" is your own internal speech. The process of not recognising it as your own is interesting but entirely consistent with childhood trauma, dissociation and invalidation.
Gentle self soothing, and gentle grounding.
Apparently McCartney (IMHO a tw@), spent ages searching for where he had heard the tune for "yesterday" as it came to him so easily, he couldn't believe it was his own.