Neurological disorders are physical diseases/conditions of the nervous system and brain. They may seem to be emotional or psychological, but there are physical causes in many cases such as tumors, seizures and the like. A person I know who has *had* seizures said that the white lights/auditory hallucinations sound like having a seizure.
You are quite right, Peter, that stating with certainty but *without* knowledge of the person having the experiences is not helpful but can fostor paranoia and prevent proper treatment.
For some good books on neurological cases I can recommend Oliver Sacks' works such as The Man who Mistook His Wife for a Hat, A Leg to Stand On, Seeing Voices, An Anthropologist on Mars, Awakenings and others.
mmaccs, have you had a chance to see a doctor?