If you’re drunk for lot of consecutive days your body/brain floods your bloodstream with adrenaline and cortisol basically to keep you alive because the alcohol is slowing down your heart and other systems. When you stop it takes several days for the brain to realize it can cut back production of adrenaline and cortisol to normal levels. This is major contributor to people shaking, heart racing , sweating and not being able to sleep., high blood pressure.
Other people explained the rest pretty well but I figured I’d mention that.
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