agonizing

"The agonizing wait for the test results kept her awake all night."

"He made an agonizing decision to leave his job for a better opportunity."

"The athlete experienced agonizing cramps during the final minutes of the game."

"The news of her illness agonized him for days."

"He agonizes over every choice, fearing he might make the wrong one."

"The thought of failing the exam continued to agonize her."