Everybody is creative. It just shows up differently.
I've identified a pattern that when I come out of an episode my creative juices are flowing. This happened at least one before. Probably more but I was not aware enough to notice a pattern. I am also much more into thinking creatively. Reading books of all sorts of topics and thinking about them and applying them to my life. When I am depressed I only read easy stuff and that's a challenge. This last episode it was zombies

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There is a neurological connection. Look into Thomas Armstrong for more. Beethoven had a severe depression after his engagement ended. After the depression he wrote his arguably best symphony ever.
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