Question for alcoholics in recovery

When I was actively struggling with alcoholism, I blacked out almost all the time. I’ve been sober for a month now. But a lot of times, when I wake up or even during the day, I question whether I did something or not. I constantly doubt whether something really happened or if it was just a dream. That used to happen to me a lot when I would black out. I wanted to know if any of you have experienced this too, and if you might know why you think this happens.