Torn Between Two Covers

Here is my dilemma: I am writing two books; one fiction; one nonfiction. It's hard to decide which one to work on and then to get the pen moving. Not only that but I am trying to figure out marketing ideas for the novel I have already published. Some days I get nothing done flitting about between the three competing energies. I would welcome any suggestions for managing my time. I love writing but sometimes it carries a stress of its own. Some days it's easy because a new idea for one of the books has crept in over night so my direction for the day is taken care of but some days I have no direction. Maybe I should just flip a coin but with three choices I would have to create the coin first. Oh, one more complication; I thought about publishing a book of poetry since I have around 50-60 poems I could use. It would serve as a giveaway - since the marketing gurus recommend having them on your website. So the question is how to prioritize and stay focused.