The first step is to see a doctor, preferably one familiar with alcoholism, then be TOTALLY HONEST with the doctor about how much you drink, how often you drink, what and how much you drink, how drinking is affecting you, and how you feel when you do not drink. This will be a beginning and let the doctor know what they need to check and whether or not you need to be medically detoxed.
Just a warning, going cold turkey can and does kill some folks, SEE A DOCTOR PLEASE!