I had a major depressive episode last year when i was 16 going on 17. Suicidal thoughts, and all the other ****ty things that come along with it. I think that it is treatable, but not necessarily completely curable like a disease. Because it is to do with the mind, its obviously more complex than a simple parasite or whatever. Even though i feel much better at the moment, i start to miss being depressed, i miss being alone and i miss having my own little secret of my depressive world. I really miss that, and people call me strange, but there is something liberating about crying yourself to sleep every night, or self harming to feel release. Its stupid i know and I've probably romanticised it way too much in my head but its how i feel often. Whenever I'm happy, something i do will remind me of last year and ill start to feel those feelings again, so whilst i am feeling better emotionally, there is still that element of "depressive residue" from my major episode.