Self hypnosis my friend... from my experience, you get instant results, depression goes away as if it never was in the first place... Also take some vitamins that help with stress.. like magnesium and so on.
Check this:
https://www.youtube.com/watch?v=SlQnYvl7FK4
And this:
https://www.youtube.com/watch?v=-MWCzkqcbzY
Listen to your headphones and relax, let go, give in to the relaxation, let it take over you, slow your breathing down, take bigger breaths of air.