The first few days were very hard. I am about three and a half months sober and have been going to AA meetings for about 8 months. Most of that 8 months, I haven't had a drink, but I think about it a lot. On my own, I couldn't have gone four days without a drink. I think all you can do is surround yourself with whatever support systems you can and keep trying.
Even though I was more than desperate to stop and more than willing to do whatever it took, it still took some time for it to 'take'. Even though my life is already enormously improved, I still want to drink, even knowing where it took me and where it will take me if I pick up again.
Four days without a drink is great effort! Keep trying. Don't let alcohol fool you into thinking you either can't or don't need to give up. When I first found this website, I wasn't able to stop drinking so I'd sit here and read it with a glass of wine in hand. Just keep coming back and posting about what's going on for you, even if you are drinking.