Don't give up on yourself after only 4 days! If you didn't have a very real problem then quitting for 4 days would not be difficult, "normal" drinkers don't phone friends to ask if they should drink, they don't call and ask someone to bring home a bottle and then when they find out the person has no money tell them to put it on a tab, and they don't have trouble stopping for awhile. Those are just a couple of red flags to show you that you do indeed have a drinking problem. As for being ready for sobriety, no addict is ever truly "ready" for sobriety, if you wait for the "perfect" moment then you will die an alcoholic. If we could stop just by being "ready" then people wouldn't go to jail for 10 years get out and start right off again risking their hard won freedom.
Have you been keeping a journal about how you are feeling and what your triggers are? Do you have any sober friends or family members you can turn to instead of turning to the people in your life that do not think you have a problem or ones that have a problem themselves?
The longer you stick it out the easier it will get to live a life free of alcohol and drugs. If you give in now, you will have to start back at day 1 and instead of the next 4 days getting easier they will be the same as these last 4 days or harder.