Multitasking is not only inefficient but also incredibly stressful.
The average attention span on a screen has dropped from 2.5 minutes in 2004 to 75 seconds in 2012, and now it's even lower at 47 seconds. Rapidly switching between tasks puts our nervous system in a state of heightened alertness.
The best way to stay calm and keep working is to focus on one thing at a time.