At your level of drinking, stopping cold turkey can be dangerous, even fatal. Consider seeking out a medically supervised withdrawl management program (they used to be called "detox"). These clinics are physician supervised and usually use low-dose benzodiazapines to wean your brain off addiction.

A lot of these programs like Fairbanks are expensive and require either good insurance or that you have the means to self-pay, but others like Salvation Army Harbor Light Centers will pretty much take all comers.