When You Are Depressed, Make Something
The problem with trying to create something is once you begin to work hard at it, you realize that you're not very good and others have done it far better than you. I have notice this a lot with math.I will work on a problem and then a Google search later reveals that the problem is not only completely solved but in a way that is far better than I could have ever conceived.  Another problem is when you run out of ideas or if the creative endeavor doesn't produce sufficient results. Creativity and execution is really hard, that I'll grant.