Hi Macushla and Welcome . Im so sorry for all that you are going through , there is no easy way unfortunately and when children are involved it makes it that much worse . I have 4 kids myself and my ah (alcoholic husband) was just released from his 4th rehab today . Its funny because while he is staying almost 2 hrs away from the kids and me , I still feel a panic just knowing that he is 'on the loose' so to speak.
Take care of yourself and your child . Dont worry about what your A is doing . You will not be able to control anything he does or how much he drinks so dont even try to . Instead of giving your energy to him , give it to your little boy , he is more deserving .
Lots of luck to you .. keep posting , this site is chock full of good advice & information !