Signs and symptoms of shock vary depending on circumstances and may include: 1  Cool, clammy skin. 2  Pale or ashen skin. 3  Rapid pulse. 4  Rapid breathing. 5  Nausea or vomiting. 6  Enlarged pupils. 7  Weakness or fatigue. 8  Dizziness or fainting. 9  Changes in mental status or behavior, such as anxiousness or agitation.