I have found recently that one of the biggest impacts on my mood is whether or not I am working. Being self employed this means having an article to write that I know I will receive payment for. Even if the story is not going to run for a week or so, knowing it is there is a huge relief.
At the heart of this reaction is a sense of self worth that comes from having work, and knowing that other people value what I am producing. Being self employed the product I create is very closely tied with my sense of self.
This is both a good and a bad thing.
While not having work can have a detrimental effect on my mood, the connection between what I write and my identity drives me to be a better writer.