I didn't actually know if I was depressed. my therapist kept asking me, but I had no idea what to say. all I knew is that I felt normal, I felt the way that I had always felt.
turns out I have been chronically depressed since I was a very young child. this depression was the result of abuse and neglect. so I was unable to identify depression because I didn't have anything to compare it to, I had basically always been depressed.
Anyway, they put me on meds, which didn't seem to make a difference at first, but then they increased the dose, and wow what a difference. I can now say for sure that I was depressed because I now know what it feels like to not be depressed. I still do get depressed, but I also am experiencing more and more of not being depressed.
I was very reluctant to start taking meds, I don't really believe in taking a lot of pills and big pharma has a pretty bad reputation. However, I have to say that taking meds has made a world of difference for me. I am really feeling much better compared to when I wasn't taking them. A couple of times I have stopped taking them -- partly just to see what would happen, and I go back to feeling the way that I did before I started taking them, which is not a fun place to be.
they now know that cPTSD causes physical damage/alterations to the brain. taking meds can help with this. But ~your actual mileage may vary~.