You are not the first "double winner" to walk into Al-Anon.
I will say, though, lots of people are nervous about their first meeting.
You've been to AA, but Al-Anon is different, and unknown, and that's understandable.
Judging by your feeling that maybe you should announce you're also an alcoholic, I would say you're nervous about that, as well. Don't be.
They'll be happy (and lucky) to have you! :ghug3