Dealing with PTSD and childhood trauma can be very intense and very painful. I am doing that work right now. Frankly, I never could have done this work without a very solid sobriety. I have been sober for 12 years.
I really believe one needs to deal with the alcoholism first, not matter what the cause. Ultimately... the cause is that the person has the disease. Get the disease in check, then deal with the rest.
Good luck.
-K