I highly suggest trying it if you haven't. Do some intense exercising; weight lifting, jogging for a long distance, aerobics, sports, etc. I've been doing 20-30 minutes on an exercise bike, then going into body weights (situps, chinups, pushups, whatever). I feel completely worn out and tired, sweaty after, but it feels fantastic. For a while afterwards, the depression is almost completely gone. Its sometimes hard to get the motivation to start, but its worth it.