My wife deal with some bad depression every know and then. I can't recall any specify route to deal with it every single instance but I can tell talking to her, breaking her daily routine are one of the things that have worked for her the most. Go out, talk to people. Trying to learn something new. Not much of a social person? Go to youtube, watch random videos, who know, you might find some content that you might like or get introduced to. Bottom line, try doing something different from what you have been doing the last week or so.