If you keep doing the same thing over and over and it doesn't work, it's time to do something else. If you're really serious about getting -- and staying -- sober I recommend AA. You can come up with a lot of reasons why you don't want to but hey, if it saves your life as it did mine, then it's worth investing 90 days.
Remember, you don't have to drink! It was a shock to me to learn that, but it's true. Alcoholism isn't a disease of the elbow, it's a mental illness. I never could have gotten sober on my own, I needed the support of other people just like me.