Pot and alcohol and that stuff make you feel better for a little while. A lot of people use them because it treats their anxiety, depression, mood swings, etc. But it doesn't fix the problems that are at the root of the problems. Ultimately, it masks the symptoms, allows you to keep on going for a while, but makes them worse. Overcoming addiction isn't easy, but you can do it.

You have tried going to medical doctors. Have you tried going to an addiction specialist? Maybe a psychologist or a substance abuse counselor? They really can help.