Hi Bodymovers,
It's possible that future visits will get easier for you, as Pandoras_Gift said, but it's also possible that Hospice work just isn't for you -- at least right now -- and that's OK if that's true.
For a number of years, I was the volunteer coordinator for Hospice in my town. My job was to train volunteers, match them with patients and families, and support them in their work. Sometimes, supporting them meant giving them permission to stop volunteering. Please know I'm not talking about firing volunteers, but rather helping some get over any guilt they might feel about moving on. Volunteering is meant to feel wonderful -- even Hospice work. Sometimes, we feel we should do something and it should be rewarding, so we make ourselves do it, when in reality it's something we dread and dislike. Then we feel that somehow we're a bad person to want to quit. Not at all. People who are meant to do Hospice work feel drawn to the patients/families, not repelled by the experience. Rather than feeling overwhelmed by the emotions, they're like ports is a storm. They feel peace within the chaos. If you're not one of these people, it just means that you're blessed in other ways, and your gifts are better used elsewhere.
Just another perspective. Maybe future visits will get easier and the work will become enjoyable for you. If not, though, it's OK to stop.