Have you ever noticed that when you're happy and content you are less motivated to create things? Maybe it's just me. I know that I've been the least productive during those periods in my life when I'm content with myself and with the world. My most productive periods have occurred when I was in a lot of emotional pain. I wrote or painted or drew and the creative release eased my suffering. Even now I find I have more to say when something is bothering me -- I guess writing it down helps to sort it out.
And think about some of the great writers, artists, musicians, and actors throughout history. Many of them were depressed and/or on drugs. Some died of overdoses. Some committed suicide.
It makes me wonder if emotional pain doesn't serve some great purpose for humankind.
As for me, I'm making an effort to do more when I feel just fine. I'm not sure that the quality of my work will be as good as those times when I'm creating to release negative emotional energy but I think it's important for me to try...