Congratulations on day five.
The guilt and regret can be overwhelming. I've been sober three and a half years, and there are still thoughts of regret of some of the things I've done, and things I've missed, while drunk or hungover.
The good news is, it never has to happen again. I live my life truthfully fulfilling my obligations and responsibly. The best I can anyway.
Maybe where possible you can make amends for your misdeeds. That can be a load off your chest.
Wish I had the answer, but the ghosts of my past still haunt me, too.
I agree to try AA. It can be immensely helpful in dealing with these issues.
I wish you the best.