By Katie Wilson Love Island All Stars contestant Demi Jones has revealed she lost her confidence after being diagnosed with thyroid cancer. The 25-year-old reality star received the devastating news in 2000 after her mum noticed a lump on her neck as she watched her in the villa. After getting it checked out, she underwent surgery to remove the lump. Three years on, after being back in the hospital every month, Demi revealed last June that she had finally been given the all-clear and would no longer need to receive treatment or monthly checkups. And after “smashing the gym”, she is now ready t…