Hi Normancita!
Firstly, congrats on 23 days. That is great, and shows you can do it.
I've found reading and posting a lot at SR has helped me a great deal.
It is different for everyone probably depending on how much you drank and for how long etc., but relapsing at 3 weeks might be a sign you hadn't got past the initial stage of healing...
For years, I couldn't get past a few days or a week without a drink. It took me a long time to realize that this wasn't just weakness but a point at which my addiction would started exerting a lot of pressure as it was starting to feel under threat. Just try to recognize your AV as panicking and say "Good! I must be getting better!"
I'm now past ten weeks and am amazed at how the cravings and obsession with alcohol has dissipated (for now, at least).