The way I understand it, depression is a disease like the flu, or whatever thing that made you feel like shit.
With the flu, you can't just wish the virus away, and you will feel like shit until your immune system and whatever treatment you received has done its job and your body has recovered. I tend to think it is the same with depression, your lungs may not be under attack, but you are still sick and it has to be treated like a real disease, possibly with medication. And I wouldn't be surprised if many depressions could be explained by conventional pathogens like viruses and bacteria.
With the flu, you can't just wish the virus away, and you will feel like shit until your immune system and whatever treatment you received has done its job and your body has recovered. I tend to think it is the same with depression, your lungs may not be under attack, but you are still sick and it has to be treated like a real disease, possibly with medication. And I wouldn't be surprised if many depressions could be explained by conventional pathogens like viruses and bacteria.