If you attach to happiness narrow and impossibly reached criteria, such as whistling Dixie with a mouthful of crackers while riding a unicycle in a hurricane, your successes are going to be intermittent, and your happiness ephemeral. Detach your ego from the goal and submerge it in the process. Serve the creative work, as opposed to expecting the work to serve you. The best work is like God, in that it serves you in ways you don't expect, and can't always understand.