How anxiety affects your focus (BBC Worklife):
Feel like you can’t concentrate on anything at the moment? You’re not alone. The extra anxiety caused by the Covid-19 pandemic has impaired our working memory, experts say … What’s happening is a malfunction of working memory: the ability to grasp incoming information, form it into a cohesive thought, and hold onto it long enough to do what you need to with it.
In other words, working memory is the ability to reason in real time, and it’s a big part of what makes the human brain so powerful. But research has showed that rapidly changing circumstances, worry and anxiety can all have a significant impact on your ability to focus.