The way see it you've already told him. You've told him before and you told him again in the email. Telling him again with a counselor is not going to get him to see it any differently. You are not going to get the kind of closure where he sees the light.
I do not understand why you would see a counselor with him. I'm sorry. I think his motives are very simple. He wants you to take care of him again so his drinking and his life is easier. I would go back to no contact.
Eventually you will feel closure even without his input.