Got More Nervous After It Ended

During the panel last week, total chill mode. Answers flowed natural, laughed with the HM, even riffed on a bonus idea. Walked out feeling solid, like "that was good." Then 20 minutes later? Overthinking avalanche: "Did that pause mean I bombed? Shoulda said X not Y? They hated the weak spot?" Confidence crashed hard.

Why does the real anxiety kick in after? Adrenaline dump? Replay hell? Brain second-guessing every word when stakes feel real?

Post-interview jitters worse than during? How do you shut it down?