I've been hospitalized for self-injury and had depression since I was young too. I've had a substance abuse problem and what helped me was getting a DUI. I had a blow device in my car for almost a year. Other than that it was/is still hard dealing with self medication. I go to a support group that deals with ptsd/substance abuse, it gets me out and lets me connect with others. I'm thinking of getting an AA sponsor or just trying to go to one to see how it fits. I may not need it all my life but in the hard times it could be a good option. Also, individual therapy I believe would help tremdously with everything you're going through. Hope you find some help.