Give me a example to describe a characters anxiety or fear

As Sarah stepped onto the stage, the spotlight flooded her with light, but the thundering silence from the audience felt like a weight crushing her chest. Her palms turned clammy, and her breath quickened. She could almost hear her heart pounding in her ears, drowning out the words she'd rehearsed a thousand times. What if she forgot them? What if they laughed? The thought spiraled, tightening its grip around her throat as she searched the sea of faces, panic threatening to swallow her whole.