The former Girls Aloud singer, 30, appeared on Good Morning Britain to discuss the terrifying experience, revealing her symptoms included chest pains and memory loss.
“I was forgetting simple things,” Nadine explained. “I couldn’t even remember the word for table. I thought there was something seriously wrong. I was like, ‘Is this a bug? Is it a cold? Am I getting ill?’”
When Nadine visited a doctor, she initially didn’t get any explanation to her illness – which wasn’t going away.
Blood tests revealed she’d been exposed to high levels of gas, but mum-of-one Nadine assumed it was through spending too much time in London.
It wasn’t until a maintenance man visited her house that she discovered the shocking truth.
Nadine continued: “I was thinking, ‘Is this me spending to much time in London? Is it the Smog?’
“Then it just so happened that a guy was coming over to take a look at my boiler. That’s when I was told for the first time that there were dangerously high levels of carbon monoxide in my house.
"We had to get everyone out of the house as soon as possible. Looking back, I was so lucky we got away when we did. Who knows what could have happened. It really didn’t cross my mind that I was being exposed to carbon monoxide.”