Have you ever had someone tell you to write it out?
Even if you are feeling something that doesn’t seem to fit with what you are working, you should always try to find a way to channel that energy and throw it into your project.
This doesn’t always mean that your characters or your piece has to match the emotions you are feeling. Sometimes you need to turn those emotions into motivation and write them out. Turn that stress and frustration into a beautifully creative piece. Use boredom as a time to throw your imagination into emergency boot camp.
So take whatever you are feeling and channel it. If you need to, time yourself to up the challenge factor.
Try to have some fun with this.