Oh God I can so relate to this thread. I have had dreadful health anxiety ever since I was very young (I was always convinced I had appendicitis as I had stomach problems). I'm 8 years post menopause and I don't seem to be getting any better. My own panic at the moment is headaches. No matter that I've had hormonal migraines, that I've been sitting at home looking at a big screen for for the last two years whilst working from home which puts strain on eyes, that I have had a lot on my mind (retirement coming in the summer, worrying about my mum being on her own and elderly, worrying about telling my work about my retirement plans etc, etc).
No, in my mind it's something sinister.
The reassuring things are that I am eating and drinking (ahem) ok, co-ordination is fine and, as my husband said, I wouldn't have been able to do my ballet class if I had anything seriously wrong with me. Doesn't stop me worrying though.
When I was very bad some years ago the therapist told me to write everything down. A letter to myself if you like, so that I could see on a page exactly how I was feeling at that time. That helped, certainly to rationalise thoughts.