I really feel you there. I have suffered from an extreme health anxiety for the past two years (started with panic disorder 12 years ago and escalated since then). I have been to all kinds of tests, labs, specialists. When it is my hearth, then lungs, then tonsils, stomach, brain, tremors, numbness... Nothing significant has ever been found. In therapy I have got to understand that my family history, some traumatic events in childhood have played a part in developing it. So letting go of the blame and realising this is not my fault has helped a great deal.
But, still learning on how to get in terms with it. As the symptoms are always new and different. Once I am okay with one thing another one starts.
It has gotten to the point where it is seriously distracting my daily life and I am considering on whether I can continue with the career path I have chosen or whether I can have kids in the future. As I am really scared my children would inherit the disorder or I would be a terrible parent constantly worrying and agitated about something.
For some years I used to take medication and it helped but have since stopped as I am afraid of not coping without them. But it really seems I do not. So considering on starting them again. I hope they would ease my symptoms.
I really recommend finding a cognitive therapy that works for you. I would have not gotten this far without it.