If there is one thing I've learned about depression is that we suck at identifying it and we suck even more at "curing" it.

I'm not a doctor. But there is a huge difference between being sad and killing yourself. There are some people who think it is just "in their head" and to "shake it off". There have been lots of diseases in our history that people thought were normal until we made some crazy discovery that what was really causing it was some previously unknown agent.