i am so glad you are here! The earlier you get help, the less you have to suffer.
I don't have any advice about the legal aspect, but I do wonder if the courts in your area have something called "drug court" and if they can refer you to that. It's a lot of work on your part, but in the end, the support is totally worth it. Search "drug courts" in your area and see if 1. they have it and 2. if you may qualify. I am so grateful to the mental health court I was referred to. I did not have a DUI but I did have some other problems.