Today we started with meeting, which was super heavy and intensive for three hours.
Boss was in a bad mood and trashed my coworker.
And there were a lot of details and questions to another section of work, but I was supposed to listen with full attention to all problems and answer the questions.
After meeting was over, we both realized that he wishes to fire my coworker soon.
Anyway, my RAM got overfilled with details completely unrelated to my current task.

The question is...
How am I supposed to concentrate after that and do a difficult coding task that requires my full concentration?
How to be efficient in the remaining working hours of the day?