What is a sentence that shows strong or sudden felling?

Here are a few sentences that convey strong or sudden feelings, each with a slightly different emphasis:

* "A wave of nausea washed over her, and she stumbled back, clutching her stomach." (Emphasis on physical reaction)

* "He was struck by a blinding flash of anger, his fists clenching involuntarily." (Emphasis on suddenness and intensity)

* "Her heart leaped with joy, a giddy lightness filling her entire being." (Emphasis on intense happiness)

* "A shiver of dread ran down his spine as the door creaked open." (Emphasis on fear and anticipation)

* "She felt a pang of guilt, a sharp twinge that pierced through her facade of indifference." (Emphasis on unexpected emotion)

These are just a few examples, and the specific sentence you choose will depend on the specific feeling and the context of your writing.