Cry. Show some raw emotion. Even if you don't have a reason... but especially if you do, it's therapeutic, empowering, and pink puffy eyes are just so attractive, to the right person of course.
We spend so much time suppressing fears, exhaustion, disappointment, sadness and uncertainty, cry it out for once. As soon as you are done, it can only get better from the clarity you receive after standing up, wiping your face, and getting back to work.