I worked as an EMT throughout undergrad at a couple different places. When I was working on campus it was mostly drunk college kids and sports trauma. But they didn't pay, so one summer I worked for a private emergency ambulance company that did mostly non-emergency transport.

It was mostly inter-facility transport. Most of these transports were people with renal failure who had to go get dialysis treatments 3x every week. On top of renal failure, to be covered by medicare for ambulance transport patients had to have something that made them unable to go by any other means. They were all on their way out. A lot of the patients I got to know really well over a few months died shortly thereafter.

The worst part was that a lot of them were losing their minds because of dementia or some other pathology. It really drills in "the-mind-is-the-body" concept, which becomes even more terrifying when you are spending 40-55 hours a week with dying people. It's also compounded by odd psych cases like Phineas Gage and the fact that chemical compounds (i.e. alcohol, drugs, w/e) can alter your personality severely. So it appears to me that all of my personality, behaviors, and experiences have a physical/chemical basis that will someday be wiped from the universe. I spent a couple months being pretty bummed out about my own impermanence.

But you run into the issue of consciousness. What is it? Why do I experience things? How is it created? Can it be destroyed? Maybe your consciousness is separated from the chemicals that make up your body. It's just along for the ride. Long after you die, the conscious observer might go on.

It's obviously really reaching. But that sort of odd metaphysics understanding is the basis for a lot of Indian religions. So maybe look into Samkya dualism and just read about it. It made me feel better, even though I don't necessarily believe it.