I had to be medically detoxed three times last year before being in rehab, and all three times I got out of rehab and went back to drinking after a while. When I finally got sick and tired of being sick and tired, then I was able to stop on my own. I still struggle and I've relapsed more times than I'd like to remember, but now have over three months sober. It CAN be done, but it takes a lot of effort on your part.
Is a medical detox a possibility for you? Getting thru withdrawals with medical help can make it easier to stay sober once you're detoxed.
You might want to give AA a good try too. I found it to be helpful to be in a room where everyone understood what I was going thru and could help me stay sober. Use whatever resources you can find to get sober and then try one of the many programs of recovery to help you stay sober. Counseling with an addiction counselor helps me a lot.
All the best to you.