Curious what kind of detox it was. Just medical supervision? Some prescription meds to alleviate symptoms? Vitamin therapy? Counseling?
The first 5-7 days are usually when the physical withdrawal symptoms are worse, in other words the alcohol is clearing your system. But you may still have strong cravings for up to 30 days. That's why most rehab facilities want people for a minimum of 30 days for alcohol, longer for drugs.
I would suggest getting to AA for support. It really will help.