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IMO the lack of energy is the sugar withdrawl. Your body has been running on the sugar from booze and is changing to running on the complex foods. the old days you could skip a meal and drink some beers etc.. when you feel hungry your body interprets that as a craving to drink. . . . . now you are retraining your body to want food when it feels hungry.
it could take up to a month for things to improve, maybe 3 to 6 months for it to go back to pre drinking levels.
regular exercise even just walking helps.