A reason for why I'm asking this is that I'm just curious about what caused your depression and symptoms. 

But I'm also getting a bit pissed off that some people say that depression is just caused by genes or that there has to be a known event that causes the depression. The truth is, depression can be caused by genes, events or both at the same time which varies between each individual. Time is also an important factor. If you keep having depressive symptoms for more than two weeks, you probably have depression.

Here is a Harvard article to back this up:
https://www.health.harvard.edu/mind-and-mood/what-causes-depression

My depression was caused by traumatic events in my life that I have not been able to get over.

What about you?