Mark,
It sounds like you are making remarkable progress! I am glad you can push off from having that drink and continue with having AF days, for I had a heck of a time until I was further along. Isn't it a nice feeling to have alcohol in the house without needing to drink it, or thinking it isn't enough to last the night? When I heard people were like that I thought it was a lie, but it does happen.
When I gave up alcohol I did feel a little sluggish. Maybe you can replace those alcohol calories with more complex carbs (fruit, whole wheat, oatmeal, veggies etc.), for it will give you the energy that you body needs. Unfortunately, sugar is something that alcoholics crave once their intake goes down, and I have found grapes help, for it curbs that sugar fix. I also freeze them to help me eat them slower.
Calories in beer is depending on the type, so here is a link:
http://www.realbeer.com/edu/health/calories.phpThe lack of energy could be the combination of less calories and less carbs. When I gave up milk (I only drank 1 cup per day), it felt like I didn't have any energy at all, for the lack of carbs was draining. It took me about 2 weeks to get past that hump.
Your progress looks awesome and keep up the good work,
Jaba