I hate depression. It's one of those things that are unavoidable for some people. I've had to deal with it for years, not the bi-polar kind (thankfully) just the low grade grey cloud type of depression. I have noticed that I get like this when I don't do artwork. If I'm not being creative then I get the blahs. So it would be easy to just go out there and do something except often I get depressed because I'm not being creative. (What a circle!)
Over the years I've developed rules about depression and how to cope with it.
1. Let it be. Sometimes depression is good for you. It gives you time to reflect. The trouble with depression-prone people is that you get stuck in it and don't end it. Always tell yourself it will end, even if you don't believe it will end. It does. Knowing it has an end is very helpful.
2. DO something. Smell a rosemary plant. I find pulling weeds helps a lot and looking at plants and listening to the birds. Last night the neighborhood owl was out so I lay in bed and listened to him while awake. (I'm pretty sure it's a he). I listen to music a lot which helps me. Nothing like joyous music to make everything a little more livable.
3. Walk and make sure you eat. Not eating lowers your blood sugar and you get more depressed.
4. Stay away from people who walk around with tiny thunderclouds over their heads. We have a couple at work and they are annoying. If you are going to be negative that's okay just stay away from a depressed person. Or better yet you as the depressed person stay away from them.
5. Be kind to someone and go out of your way to do something nice.