Wishing you success with the annulment.
Your five-year-old will need some extra attention in the coming months, watch for signs of anxiety or anger, as he has been exposed to the vortex of chaos you married. Keep your home life very simple, routine, and quiet for him and attend to his feelings.
She is not only an alcoholic but also very likely has a hard-wired personality disorder which sobriety would not cure.
Once your legal issues are resolved, you might do a run of counseling for yourself, as it was you who made these poor choices and whatever motivated you to do that is still operating inside you. Here we always circle back to ourselves and try to take responsibility for our codependency so that we don't enter into another damaging relationship (it seems those without recovery always do).
On the opening page there are items labeled STICKY which will link you to good reading for your own recovery and self-awareness.
And that residual anger you are bound to be feeling.....it will be great if you can do some hard physical activity--the gym or house repair, etc--and get that out so it doesn't erupt onto innocent bystanders.
We are glad you found SR. And I wish you a peaceful, healthy home life with your child.