Well juju I see I am a day late and a dollar short, I did not do rehab, but I did go through a 5 day detox which did get me through all the nasty parts of detox like the DTs!!!!
Just open your mind, be willing to learn and to change. You have 12 years of sobriety that you can lean on. Try to focus on why you relapsed and work on that.
Sit down and ask your self "What did I quit or start doing that led me to relapse?
Be honest with the folks in rehab, honesty will get you a long way towards long term recovery.