I can't get too excited or nervous or less sleep or i'll continously feel like vomiting. I don't know whether it is true or not, but its called Tachycardia. Tachycardia typically refers to a heart rate that exceeds the normal range for a resting heart rate. Its not harmful but it makes me feel uncomfortable each time i feel like throwing up because when i do, it happens almost every 5 minutes. Normally, it frequently happens before my badminton match started or exams and so on.
Info from Wikipedia