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Mild alcohol withdrawal is anxiety and irritability but as part of what it acts on is GABA receptors severe withdrawal is nuts.
GABA and glutamate work to regulate excitation (how much signal and how much they spread roughly) in the brain. A sudden deficiency in gaba and neurons are too active. You get shakes, hallucinations, and eventually neurons die in a process called excitotoxicity.
It's one of the rare drugs where withdrawal can actually kill you. Fortunately that required being pretty high on it chronically. Most alcoholics will just experience restless anxiety and dysphoria.