After giving birth to her second child, Rose Stokes was exhausted all the time.

"I couldn't really do anything more than the bare minimum in terms of looking after my kids. I'd put them down at seven and have to get straight into bed," the freelance journalist says.

Rose thought it was just what being a mum of two young children was like.

But being tired wasn't the only problem.

"I also had other symptoms, like my hair was falling out.