Lucy was lying unconscious on the floor. A pool of deep red blood had formed around her wrists and head. She'd clearly cut herself, but must've injured her head when she fell. I checked her breathing, although it was barely noticeable, and called for an ambulance.

"What has happened to the patient?" the lady on the phone asked.

"She's cut her wrists and fainted, which has caused a head injury."

"And is she breathing?"

"Yes, but it's poor."

"Okay, be ready to perform emergency CPR should she stop altogether. Is there any sign that she may have overdosed?"

"No, I don't think so." I worried about how my earlier jaundice concern may have something to do with why she fainted. I grabbed her bag as I spoke to the lady on the phone. "Actually, she looked very pale earlier, and I thought her skin had a yellow tinge to it."

"Has she got any belongings with her?"

"Yes. I'm just going through her bag." I rummaged some more before finding something that deeply shocked me. "There's 3 empty boxes of paracetamol."

"Okay, what's the dosage?"

I was silent. I couldn't believe my eyes. Lucy had been the happiest child I've ever known. She was always so incredibly positive.

"Hello? What's the dosage?"

"Uh, yeah, sorry. 500mg. Please hurry, she needs help!"

"Okay, the ambulance should be with you within the next 10 minutes. You're down as an emergency."

As I said goodbye and thanked her for her help, Rachel came in.

"Oh my god," she said as she saw the sight in front of her. "We need an ambulance."

"On it's way."

"What happened?"

"She's self harmed and overdosed."

"Oh god, the poor thing. I never knew anything was wrong."

"Nor did I. She always insisted she was fine. I did have a chat with her though, about half an hour ago. She got quite upset and needed a moment to cool off. I wish I'd never had left her."

"Hey, this isn't your fault. Judging by the colour of her skin, she took an overdose a few hours ago. I just hope it's not too late for her."

"What do you mean?"

"You're not likely to survive more than 12 hours after a paracetamol overdose. All of your organs fail and shut down. Her skin is showing liver failure already."

I thought about her words as she phoned Eddie Lawson. He moved the class opposite the toilets to a new classroom, and warnbed teachers not to let any students out of the classroom for any reason until further notice.

10 minutes felt like hours. I was constantly checking and rechecking Lucy's breathing, and eventually the ambulance crew arrived.

"Can I go with her?" I asked, feeling guilty as though this was my fault.

"Yes, let us know whats happening."

"I will," I said as the ambulance doors swung shut and the sirens began to blast as we began to move.