Welcome to SR!
In my opinion the only way to get sober is to just do it. Whether it be rehab, AA meetings, another recovery program, counseling, outpatient therapy - it's all up to you. It will be more difficult to get sober while living with an active alcoholic, but it can be done if you do it FOR YOURSELF. Don't try to solve his problems, just work on your own. Today would be a good day to stop drinking.
