He could not tell if what he was seeing was real or if it was a 'hallucination'.
He has been having 'hallucinations' due to the medication.
(..) I'm not sensing anything. We could be looking at hysterical neurosis. That would explain the multiple personalities and hallucinations. That doesn't feel right, either. Well... I can't explain it. My heart is telling me to believe them. I heard that voice with my own ears, (..)2016 The Conjuring 2