First of all you don't know you have depression. Suffering from a family crisis isn't depression, it's grief and anger and sorrow and frustration. If you don't do something about it, though, it can become depression. As for your memory, given you say you're going through a lot of emotional turmoil, you're probably distracted. Is there a counselor you can talk to? A therapist? Some professional who is detached from your situation who can help you deal with the emotions you're feeling?