I used to have health anxiety a while back alongside all my other fears & phobias. Eventually, I just gave up, I stopped caring, all my worriesome thoughts got replaced with:"It's not worth living this way, I rather just give in & die than keep living with these awful feelings." While losing the fear of death did not make my fear of talking to people or being judged go away, it definitely did something in the health anxiety department. Eversince I started being apathetic towards my own body & mind, I've actually noticed a huge drop in panic attacks & even anxiety. However, I can not recommend this to people as it seems to me like a really flawed way of looking at life, I was just answering to your question & how I got myself to stop assuming the worst. I feel 100 different sensations on a daily basis, all of them negative, palpitations, throbbing in the head & neck, stiffness, fatigue, derealization, you name it, but I no longer care, I just let my body do its thing & get over it, I'm too tired to keep worrying about what all of these feelings mean.