What drives a creator to create? For some it may be the legacy of fame or the luxury of fortune, but for many, if not most artists, I think they create because they have to.
In the absence of creative endeavors, some broken part of their subconscious wells up and presses against other functions of the mind, disrupting them.
This quickly becomes a curse as the desperate rattle of a painting, or novel, or album drowns out all other thoughts. Days or weeks are lost while plumbing the depths and branching ideas of possibilities. The torturous frustration as the clumsy body fails to recreate into reality the immaculate vision of the mind.
But the highs, oh those highs! When art flows and you are a conduit for lightning! When knowledge, skills, and training finally align into a perfect focus turning random diffuse light into a hot, fast laser beam. That is the feeling of immortality, the feeling that seems to justify this brief, fragile existence.
So open that release valve, just a little bit, and let the demons play for a while.