This is 40..

I feel you. If proof is best for you, you can always get blood work done to make sure you're healthy. But, instead of reassurance and thousands in medical bills, ik easier said then done, but until something actually feels wrong or you know something is wrong, try not to worry too much about your health. Drink water, eat decent and exercise and they rest is up to the universe. Don't stress too much, I'm sure you're not as unhealthy as your ocd believes!

Oh I’m in your same boat

I’m obsessing over it at 35 , damn I got it 5 years early

This is something that we have to accept that we can’t control, I’m 22 and terrifying about death as well. At the end of the day wouldnt we rather just enjoy and experience life rather than spending day and night worrying about it. Life is confusing and we can’t get all the answers in our life time so we must simply just live because that is all we are here to do. All that matters is that you are here in this moment.