Admitting to you he has a problem is HUGE! A great first step, as everyone has said. So is going to talk to a counselor.
My opinion is that it is ok for you to go to the first meeting with him - it is scary - and you will be able to find a contact for meetings for you - either Naranon or Alanon.
Those meetings helped me understand what the addict was going through and more importantly, how much I was affected by someone else's using. They were addicted to the drugs and I was addicted to them. Took me awhile to really believe that, but the wonderful folks in Alanon helped me make some necessary changes in my life.
Today, I am ok whether or not the addicts in my life are using. And that is truly a miracle!
Keep coming back - we need you.
Love in recovery,
Jody Hepler