Someone made a comment that praying in tongues helps with depression, and I'll like to say that i agree with him/her.
Ofcourse, there are different types/manifestation of depression. My own depression came without any external trigger( no bad occurrence or death of a loved one). But am sure its different for some people. So I'll just like to talk about my own specific case.
I've noticed that whenever i spend at least one hour everyday praying in tongues, and i only do Christian activities (except work), like reading the Bible, Christian books, sermons etc my depression disappears. But my problem has always been that, its very difficult for me to live this way for a long period of time. Before 6 months, i always go back to watching movies, sports, games etc and the depression comes back.
My point is; i agree totally that praying in tongues, and getting involved in Christian activities exclusively, helps with at least one (if not all) type of depression. I hope this helps someone.