For my depression. I gave her her own blog. I figured if she was going to throw tantrums and be dramatic, maybe she should have a space of her own to pour out into. Maybe then we can spend the rest of the day a little lighter. 
The more I write, the more I see pieces of myself and not the sadness that consumed me. She chimes in every other paragraph, no doubt to say something shitty or sad, but the next sentence usually shuts her up. At least for a little while.