I didn't know when I collapsed at work - it was low vitamin D

• 15 hours agoVicki LoaderHealth reporterTwenty-three-year-old Saskia Reeves-Priestley was at work when she suddenly collapsed.
• "I just felt really dizzy, really nauseous, was having heart palpitations and was really hot," she says.
• Saskia, a special educational needs teacher, was a keen goalkeeper who played football four times a week and felt fit and healthy.