One of the hardest things about depression is that you tend to forget who you really are. That smiling person that genuinely cared is probably gone. Not for good, but gone. Left is a somewhat empty, tired shell of what used to be you.
The process of regaining yourself is long, because depression has now changed you and is part of you. Now you have to figure out who you are now, and how to fill the empty shell. The tiredness may never go away, but the shell… well, the world is your oyster. You can start from where you are, and keep going.
It’s very hard to explain. But now that you have been gutted by depression, the remodel and subsequent “decoration” should follow. Even though you were gutted, you still have your values, your morals, spirituality, passions. Live by them, and you will be happier, youer, and better.
It’s a process that involves acceptance. Acceptance that things are not the same as they used to be, but it doesn’t mean it’s acceptance that life will be forever crappy. Once you have accepted that things will now be different, you can start rebuilding and regaining yourself.