A friend has fought an ongoing battle with depression over the years, bravely experimenting with all manner of treatments and therapies. Happily she's making headway at the moment, working with a coach, and I liked her explanation of what they're doing together - she describes it as aiming to 'flip' her thinking. This makes sense. I'm sure that a lot of low mood is caused, or at least not helped, by negative thinking.
Sometimes we get mired in the kind of thinking that weighs us down, a bit like falling into water wearing a heavy overcoat. Removing it would give you a better chance of escaping, but it's often the case that the negative thoughts won't go away. Of course it's not realistic to imagine that you'll go from Negative Thought City to Positive Town in one step. But that's not to say that you can't begin to turn your bad thoughts on their head. Why not see if you can try a little of that today?