My poor daughter over the last six months or so has become very ill at every period. Vomiting and feeling dreadful with period pain. Her most recent period she vomited every half an hour for more than twelve hours. She's regularly needed to take a day off each period or I've had to collect her from school. We had a private scan which was normal. Could it be hormonal? Has anyone else experienced this? She has her GCSEs coming up and would not be fit for an exam if she's on the first day of her period.