I totally empathise OP. I have health anxiety and cancer is my biggest preoccupation. I have always suffered anxiety to some degree but it has manifested in different ways over the years. The health anxiety started after I lost my Mum and Dad to cancer within 10 weeks of each other, nearly 10 years ago. I went through a period of two years of intense health anxiety (alongside my grief). Ironically, I was in such a state of high anxiety that the anxiety itself caused physical symptoms which I then focused on and believed to be symptoms of cancer and then I became more anxious, and so on. So I was in an awful vicious cycle for a while there. For me, it was SSRIs and talking therapy that helped me get out of that cycle.
When Covid kicked off, I fully expected my health anxiety to come back but it didn’t, much to my surprise and relief. But then recently, I’ve had another resurgence of it when I was having some gastric/digestive problems, and an old school friend died of cancer 3 months after first going to the Dr.
It seems my health anxiety is focused very much on cancer and other illnesses don’t seem to trigger it.
I know it’s pointless me telling you to resist the urge to Google symptoms or changes in the body. Pointless because you doubtless already know, and because I know it’s very hard to ignore that urge when it strikes. The thing is, almost any symptom or bodily event can be a symptom of cancer. So Googling anything health related is always going to bring up results mentioning cancer. Which doesn’t help you in any way.
For me, medication and talking therapy helped hugely. In particular, CBT is often used for this type of thing as it teaches you to stop those thoughts in their tracks and challenge them.
I really hope you can get some help with this as I know how debilitating and terrifying it can be. I can still remember the palpitations and waking with a start in the middle of the night with a feeling of terror, convinced that I had cancer and would die from it imminently. It’s awful and you have my sympathies. 💐