I've been feeling depressed for pretty much no reason at all for some days until I found this video today. My first thought was "This is fucking stupid..", but I tried it anyway and here I am ~8 hours later and I'm still not depressed. So what if it's placebo, I'm not depressed anymore.
Try it out if you're feeling depressed, maybe it will work for you too.
It's a introduction to something called tapping.
https://youtube.com/watch?v=6i33V2EcVlY