Cena's Little Helper
Mid-Card Championship Winner
It's definitely, definitely contextual. The fact you referred to the period as "the darkest times of your life" imply that you did not have clinical depression in the sad for no reason sense, in which case your experiences will be wildly different to those with long term causeless depression. Correct me if I'm wrong, obviously.
What do you mean contextual? Do you mean specific only to myself, and thus not generalizable to other instances? Almost all cases of depression involve social causes. Depression shouldn't be seen as being in a state of absolute and irremediable melancholy. Rather, it should be seen as a tendency to become depressed when certain conditions aren't met/don't hold.
There are instances in which people can become depressed for little or no reason, but, I would argue that those aren't cases of clinical depression, but are rather cases of bipolar disorder, which is a totally different monster.