Please consult a doctor immediately both for a clinical
and a psychological assessment.
Depression, dementia, alcohol abuse, migraines, diabetes, abuse of certain drugs etc can also cause auditory hallucinations or hearing voices. It can also be a part of schizophrenia, schizoaffective disorder, schizophreniform disorder, shared psychotic disorder, brief psychotic disorder, bipolar disorder, substance-induced psychotic disorder.
Hence it is important to consult a doctor as soon as possible.