I worry constantly about getting cancer, because one of my aunts died of it. So clearly, it's in my family. Am I being unreasonable?

What you haven't realised is that a staggering one in four of us dies of cancer. So if you've only had one aunt who was a victim of a carcinoma, that doesn't really suggest there's a lot of malignant disease in your family.

It does sound as though you've become rather obsessed with this worry, so I would suggest you try and get yourself a few helpful sessions from a cognitive behavioural therapist.