Fight the misery! Do not justify it!
Adopt a goal of pushing your grief AWAY. Anticipate to get better and move in the right direction - AWAY from grief.
As long as you are continuously moving towards a positive goal, as long as happiness remains your destination, you'll inevitably get there.
We are here to provide you with a GPS, so that you don't get stuck in traffic. Read our road sign! Happiness is closer than you think!
Perhaps, stating to yourself and others that you are grieving or depressed won't make things better. That way you are programming your body to linger in the negative mode. Try a different attitude and fight the misery rather than justify it.
All you need is a determination to overcome the current situation. Viewing grief or depression as a temporary setback is key!