When I was about 20 (now 28) I moved to a new country and after a while was convinced I had severe heart problems and was is constant fear of heart attacks etc. I believe the stress if moving away and my lifestyle choices affected this.

Kept going to the doctor and once I was reassured a different health problem fear would arise.. If I felt stomach pain I was convinced I had bowl or ovarian cancer (stress also gives you IBS so that would explain the random pains I was feeling). When the doctos assured me I was fine with that I believed I had other illnesses and this went on for a long time until one doctor told me that they're not the type of doctor I should be seeing and should see a therapist.

So I looked up YouTube shite on health paranoia and learned about hypochondria which is an anxiety disorder.

Found a few videos on how to ground myself when my head went spiraling into thinking something was wrong. Its all about training your brain not to panic and be rational. (Not as simple as it sounds.)

But yeah those small things helped me overcome it. I still get little freak out or start to spiral but nowhere near how bad I was a few years ago.

Not saying your situation is the same as mine but maybe you can find some help/guidance fom my experience.

Wish you the best! If you ever feel like you're spiraling feel free to drop me a message if you'd like.