Hi - my 12 year old daughter has been sick three times over the last 10 weeks. She started her periods in between these bouts of sickness. Sometimes when she is sick she feels fine afterwards but other bouts she have completed washed her out and she s felt dizzy and generally unwell. She has obviously missed some days off school because of this. When should I start to worry and take her to the doctors? Any what could this vomiting be? Thank you