I've gone through depression a few times and for me it's more just the ebb and flow of life. I've ridden incredible highs and hit some pretty bad lows. But at the low points, there really isn't anything to be done but wade through it. You feel numb to pleasure, life seems complicated, and any plans you make to improve your situation just feel pointless.
I think depression, like most mental illnesses exists on a spectrum and Tim's advice can help, but not necessarily solve the problem. The brain is so complex not even our most intelligent scientists can figure it out. I think some people are born with or create a chemical imbalance in their head, and have to try to find a way to level it. I'm lucky my depression has never been bad enough to go down a medical rabbit hole, but for some folks there's not much choice. And I've personally known a few who found their "perfect drug regiment" to largely fix their issues.
At the end of the day we have an incredibly motivated and energetic former special operative here trying to lecture people on how to be happy. Personally I'd be a lot more receptive to someone's opinion who's actual been in the mental "shit." Feel free to correct me if he has, but doesn't strike me as the type.
As a side note, for anyone having a hard time go listen to Dominic Cruz's podcast on JRE from a year or so ago. Dude always seems so solid mentally, but he talks about depression and what all the injuries did to his psyche, and having to really fight his mind to get back. Pretty inspirational stuff.
Now that the sentimental shit is over imma get back to trolling...