As an ACOA (adult child of an alcoholic) I can tell you it has a very real impact on you. as a child you usually have one or two special wishes, a pony or Disney World or something like that. Mine was I wish I was dead. You don't want that for your child.
So, go to Al-Anon and get the tools you need to improve yourself, your life and the life of your child.
Your friend,