Psychological advice for a teenager struggling?

I don't know what else to say, but I think you should either check in to a rehabilitation center or check into a mental hospital. If you don't want to jump to that, you should talk with your psychiatrist about your eating disorder, alcohol problems, and drug problems. I don't think sleeping pills is the best idea for a minor, you should talk to your doctor about that. As for the eating disorder, you should make checkups with your doctor to see if you are underweight, overweight, or at a healthy weight, and keep track of your weight. No offense, but the "after life" is just some crazy thing thought up by Catholics. If you are contemplation suicide, call the suicide hotline at 1-800-273-8255. I really wish the best for you.