I have been in that dark hole. The worst part was not knowing when it will end. I am gradually adding "tools" to my arsenal to fight depression. Basically, it is self care. I try to eat as healthy as I can afford. I go to therapy on a regular basis. I am gradually exercising more. I no longer deliberately have negative self talk.
It is not easy. I slip up. I have mood swings. I have days when I want to give up.
I hope some of this helps, F.M.