Find a meeting and go, find several and try them all until you find one that fits. Commit to finding help for yourself with the same energy you committed to finding help for your child. Because you are going to need that help one day soon or you're going to sink into the darkness with your child like this mama did.
It was recommended to me that I do this about 6 months into my son's addiction, about the time my codependency was becoming obvious. I didn't listen. I thought "he is the one with a problem, he is the one who needs meetings" and just dug my heels in.
The best gift I ever gave myself, the gift that literally saved MY life was finding that first meeting and walking through to doors. That was the beginning of my recovery and the life ring that I so desperately needed.
Hugs