A simple alternative...

Remain still, remain aware of thoughts that cause depression. Remain aware of sensations that accompany the depression. Usually, a sense of attachment, or "pushing away" of certain sensations can be felt. As RM said, it could be in the chest region....

Watch these sensations as a third person. Without reaction and without other thoughts, just watch. Don't feed the thoughts, just watch them as they arise and watch how it affects your thoughts, reaction and bodily sensations...

reference Vipassana

What is occupying that corpse you call 'I' ?