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Venting is good (although, it does not change much) With his history of depression and of what you are reporting substance abuse, change on his part (may either take too long if he is willing to get help, or it may not occur because he may not see anything wrong with his attitude)
Unfortunately depression may predispose someone to use alcohol (in a way to self medicate or dull the unpleasant emotions he may be experiencing other wise) In addition, alcohol is a depressant (it may make him feel better for a while but then when the effect wears off, the person would feel more depressed) Irritability and anger are also common in someone who is depressed.
What may be helpful is some therapy for him, family counseling and possibly finding support groups in your area. Of course, he has to play a willing part in all of this.