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Christine,
Intermittent excessive drinking is a very common pattern amongst problem drinkers. The key is loss of control once drinking starts or progesses past a certain point (Type I). Much more common than the everyday, continuous and dysfunctional drinker (Type II). This is a distinct typology and one does not progress into the other although the drinking bouts may become more frequent or intense.
Your assessment is on point. He learned to use alcohol for the purpose of intoxication (binge drinking in college) and that practice has been carried forward although it is no longer functional and has in fact become counter-productive.
Whether this is alcoholism is largely a semantic issue and will depend on who is making the assessment. Suffice to say that it is a maladaptive behavior. It isn't necessary to assign a label or to conjecture if there is an underlying addiction. Such labeling (diagnoses to some) usually do more to inflame than to clarify. Alcoholism, addiction and similar phrases still have a pejorative effect and too often mobilize personal resentment and defenses that complicate rather than expedite correction. Leastwise at this stage of intervention.
Drinking to the point of oblivion with blackout is abnormal, dangerous and bereft of benefit. He knows that... You know that. And, he knows that you are concerned about his drinking yet he continues the practice despite such knowledge. Whether that is a personality disorder, bad habit, learned behavior or addiction is unimportant. The behavior needs to be addressed from his standpoint (over which you lack control) and from your standpoint (for which you are entirely responsible).
Here, let me advise that talking to him
while he is drinking serves no purpose. Avoid that. It is certainly appropriate to express your concerns but do so only when he is entirely sober and avoid inflammatory or accusatory terms, "alcoholic," "addiction."
You need to put this in a proper perspective, learn what you can and cannot do and how you can sustain. I'm providing the number for
Al-Anon where you can find other people (a lot of them) in similar circumstances. This will help you to cope until he is willing to act.
1-888-425-2666 Monday through Friday, 8:00am to 6:00pm ET.
http://www.al-anon.alateen.org/english.html