There are many symptoms that could possibly occur before the hallucinations begin. Symptoms include headache, dizziness, irritability, insomnia, and indisposition. Typically,<unk>  has a sudden onset.
Alcoholic hallucinosis
Stimulant psychosis
Benzodiazepine withdrawal syndrome
Myxedema psychosis
Alcohol withdrawal syndrome
Substance-induced psychosis
Dancing mania
Benzodiazepine overdose