Welcome Heather, the first few days were the roughest for me, rest assured that it does get better. You're getting a good jump on your recovery by going to AA, try to listen for the similarities rather than the differences, get lots of phone numbers and don't hesitate to call someone, and reach out for support as much as possible.
You've got a very fulfilling life ahead of you in sobriety, just be patient and do the work, you'll be rewarded for your efforts.