Once a month is pretty frequent IMO for a 36 year old man to be tying one on like that. I drink, but I don't believe it's okay to get drunk, you know? Having a few drinks socially works for me, but I'm 41 and way too old to be partying like a frat boy.
Drinking and driving regularly? That sounds very reckless. While many non-alcoholics have done it at one time or another, getting plastered and drinking and driving on a monthly basis definitely sounds like alcoholic behavior to me.
Have you asked your husband to stop getting intoxicated? Do you think he could if he tried? It's hard to say if he's a full-blown alcoholic, but he's heading for a DUI at any rate.