Can't find luka's advice on this thread (I think) that actually has made sense to me a lot over the last year in particular - that he used to have a negative voice in his head and then he killed it.
It sounds very simple but I think there's something to that. A lot of my depression is generated by a self-criticising voice that I feel compelled to 'listen to'. It is rather like carrying a tiny annoying Thom Yorke around in your head the whole time. A tiny Thom Yorke that, like Ant Man, is ten times as powerful as a fully grown man.