https://www.scientificamerican.com/article/3-secrets-to-beat-performance-anxiety/

Listener Adeel from England wrote in to ask how he can perform better under pressure. Adeel has spoken English as a second language for many years and has excellent communication skills. But he notes that in high-pressure situations, he sometimes gets anxious and the words don’t come, plus his accent becomes more pronounced. What can he do to remedy this?

Anyone who’s ever been in a similar situation—and that’s all of us—can empathize. Even with tasks we've done a million times—like speaking a second language, walking up stairs, or navigating the grocery store—under pressure or observation, we get psyched out. We lose the most basic skills. A friend told me that once, during a lunch interview, she overthought how to swallow and had to sit for a few moments with a mouth full of iced tea before she could collect herself and figure it out.