When priorities change quickly, I would go over the schedule, I would do everything that's on the schedule, and go from there, but also at the same time, I would review everything that needs to be done, and that has a deadline. The only time I've ever had that happen is while I was at work, and I was on one schedule at a time, and I had it change quickly on me, and got done with that one, and I went on to the next one.