You have to be sober long enough to get the toxins out. Detox would help huge and you would have the medical help to balance the withdrawal symptoms. I don't suggest you do it on your own.
Our bodies are amazing machines. They can adapt. That's what happens with the intake of alcohol. They adapt to it. After a while they require it to go on working on a 'normal' level. I know of someone that was arrested and given a breathalyzer. Tested at .49. Supposedly your dead at .5. After 2 days in the tank, they tested him again and he was at .27. When I was arrested for DUI, I tested at .29. Couldn't walk, talk or breath normal, but this guy was acting completely normal at .27. His body had adjusted.
Takes medical assistance, and time to get our bodies away from this. But it is most definitly worth it.