"Google is not my friend. I'm always looking up symptoms and it always brings up the worst diseases. I could sit in front of a laptop all day diagnosing myself. I've always been a hypochondriac but it's getting out of hand. I get a headache and think I have a brain tumour. Every time there is anything wrong with me, I panic. I also get really bad sleep paralysis, which is horrible. It freaks me out." British rapper Professor Green worries about his health.