For 20 years your brain has taught itself, conditioned itself to have that wine. Behaviourally, the ritual of getting it, the chemical changes and subsequent physical reaction/emotional 'reward' thing. Then all of a sudden your brain decides enough is enough. But your brain is having a hard time unlearning and is also chemically/physically changing. Takes time. If you are feeling anything physically or emotionally different, perhaps go see your doctor. Anxiety and depression hit me very hard, on top of a lot of other stuff.