The worst stages of alcohol withdrawal are hallucinations between 12 and 24 hours after drinking and possible seizures at 24 to 48 hours after drinking. Shaking and fever usually begin 48 hours after stopping heavy drinking, explains WebMD.
Shaking, fever, anxiety, irregular heartbeat and possible seizures are associated with delirium tremens, which usually peaks five days after stopping drinking, according to WebMD. There is a 1 to 5 percent risk of death from alcohol withdrawal during this stage.
Withdrawal symptoms occur after prolonged and heavy alcohol consumption stops and the brain's previously suppressed chemicals become active. The brain becomes overexcited, causing agitation, anxiety, tremors and other symptoms, states WebMD.