Reminds me of myself, last Friday. Just arrived in Vienna to learn I had a presentation coming up. Had to plan my day, the presentation, type it out, draw graphs, sleep, with not too many hours available. Plowed through successfully but decided to start with a nap. Good luck!
We all have those creative moments when it is easy to produce. It is another thing to produce when everything is complicated, we still have to imagine the solution because we don't know it and it can't be searched on Google, and disheartening. There is something to be said for people who are discipline to keep moving during these times.