I really liked this article on the "darker" side of yoga. As it progresses, I feel it's more about life in general and exploring the truths.... of it, of yourself. It doesn't necessarily have to be yoga that gets you into those raw places, maybe it's meditation, prayer, something else altogether....but however you get there, if you've been there, you will probably enjoy this read.
Life's not all cupcakes and roses, as I'm sure you have discovered. But it's important to become still, and even if what comes up doesn't feel very nice inside, sitting in those not-so-nice places, that's where growth truly comes from.