Introducing the Indie Writer's Wheel of Pain

Doing what I love shouldn't depress me. Right? But everyday I do what I love. And doing what you love is supposed to fill you with purpose. And when I'm writing, I feel fulfilled. When I'm marketing my writing I feel excited. When my books don't sell, I feel depressed. It's a vicious circle. Manic to depressed. Do I then suffer from manic depression? Am I bipolar? I could draw a diagram to represent it easily. In fact, here:
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