feeling as if everything around is rotating;
Sharp dizziness when standing up is often associated with an orthostatic reaction — a temporary decrease in blood pressure after a change in body position. In such a situation, a person may feel weakness, unsteadiness of gait, noise in the ears, darkening in the eyes, and other signs of loss of consciousness.
Most often, such a condition occurs after lack of sleep, dehydration, prolonged stay in a stuffy room, physical exhaustion, or taking some medicinal products. If episodes recur, are accompanied by rapid heartbeat, chest pain, or pronounced weakness, it is necessary to consult a doctor.