I wouldn't worry about the dreams about relapsing ****. They are very common and just happen from time to time.
What concerns me about your post is you saying "I thought I was totally in control". If you believe that, your over-confidence could lead to relapse. I think I always walk a fine line. I have been sober for awhile, but I know I am only one drink away from going back there. That doesn't mean I fear losing it every moment of every day. But, I think that being vigilant about my daily life is far more important than believing that I am in control.