The most important thing you need to remember is the 3C's.
The second most important thing you need to remember is that you don't have to make any decisions
right now. You don't have to do
anything until you're ready to do it.
For some people, rehab helps. For some people, it doesn't. It depends upon when
they are ready to get better.
It sounds like
you are ready to get better, so by all means, Al-Anon and Nar-Anon are for you. Depending upon the age of your children, there's also Al-Ateen, which could help them talk about some of the things in their mind without them worrying about hurting either of their parents (since neither you nor your wife would ever know what they said).
Whatever you decide to do, you are not alone. There are a lot of people at this site, and you would be surprised just how many relate to what you say, and how you feel.