Breath, @stellabelle.
Take a deep breath, hold it, and release in a long, deep, sigh...now, do it again, and place the majority of your focus on this deep breathing process. Repeat this again and again for five to ten minutes, as many times a day as seems right.
Seriously, this type of simple breathing meditation has helped me take HUGE strides towards feeling more positive and peaceful.
I've been near rock bottom. I know how abusive a severely depressed mind can become. I've tasted pure apathy. I've approached contemplating suicide from millions of angles and have experienced tasting the most satisfaction from visualizing myself dying. I've experienced PURE self-hatred.
I've been there, and I'm now light-years beyond those doldrums, thanks mostly to conscious, deep, breathing exercises that I essentially forced myself, as a last ditch effort, to do, when I was feeling so low.