Well, in all honesty, that would be the perfect answer to the problem - give up, don't bother, lose your cool with the situation and don't give a fig.
That approach would certainly reiterate that there is nothing to worry about.
If you have IBS -C (which I have also had badly incidentally, due to hormones and end of my reproductive years) then you certainly do need to be thinking about diet and increasing fibre etc etc blah blah. Then you more than likely know this.
No, its not stupid, its a behavioural pattern based on fear that you've got tied up with, along with many many other people past and present. Look at this site, most posts are related to health anxiety. A lack of trust in doctors, believing symptoms exist pointing to terminal illnesses, Obsessively checking your body and thinking about a 'problem', linking random body sensations into something catastrophic, ignoring likely cause and effect and jumping to illogical and terrifyingly rare conditions, feeling reassurance for a very short time....then the whole pattern starts again....is part of the course unless the cycle is broken and you retrain how you think and react. I know that what I say to you now, today, will have a very short-term effect on you feeling any better, as until you tackle the route of the problem it'll keep rearing its head. You need to start self-reassuring, counteracting your assertions with logic, out loud if possible. Write lists about why this isn't a secondary liver cancer, when thoughts pop into your head saying it IS a secondary cancer - read out loud the list you've written. There is lots you can do for HA, its not an illness, its a damaging pattern of thinking and it allows fear to become the cycle that drives your daily life and mind. Have a look at some of the 'stickies' at the top of the HA forum, there is lots that is useful there.