I spotted your question on the forums and thought I might direct you to an app I have written, available completely free on both Google and Amazon app stores, called Mind Your Mood. By trade I am a software developer, and have suffered Major Depressive Disorder for many years, so hopefully the content is relevant! Make sure you search for 'Mind Your Mood' (with capital letters), as Google Play seems to get confused otherwise.
Please feel free to try the app - and do contact me with any suggestions and comments you may have.
All the best,