I've only had a short career so far, but I know I will always carry the first young man who I had to tell had tested positive for HIV. I'll carry his denial and bargaining - "I had a negative test 6 months ago, I've only been with my boyfriend since then, how could this happen?" and his realization that he'd have to tell his partner to get tested as well.
I carry the dementia patient who had extensive family but never any visitors. She would care for her "baby" (a doll) and get frustrated with being unable to communicate - but I carry her delighted laughter when a fellow student nurse had the babydoll start doing the Dougie.
I carry my grandfather, who was unable to leave the casket of my grandmother for her entire wake, just weeping and asking for her to open her eyes. I carry my own regret, when a few years later I waited too long to go visit him in the hospital.