Karen,
You can go either of two ways here. One way - learn from this valuable experience and DO NOT allow it to ruin your future success, or the other way - just tell youself what a failure you are (again) and allow yourself to 'fail' again and again over the next few weeks.
Your subconscious is trying to sabotage what you are doing.
You are moving out of your comfort zone and some part of you does not want you to.
Your behaviour is completely normal. You now know to be vigilent when it happens again. Over the next few weeks you will learn strategies to cope with these feelings.
Please be honest when you go to your next meeting and talk to your councellor about what happened, the circumstances, how you felt before, and after. Ask for help and you shall receive it. If you feel confident enough, ask if it can be discussed with the other members (I know at this time you don't know them and may feel uncomfortable admitting something like this). It is immensely comforting to hear of others' experiences and indeed, you may find that other members may have done the same but not been couragous enough to say so. Honesty is going to be an important factor to your future success and healing. Honesty with yourself as well as others.
I wish you the best of luck on your journey Karen. You've made a great start in being honest!