I am an acupuncturist and herbalist. Before I did this, I was a community college professor. In both cases, the focus was helping others. There is nothing better than work in which you serve and help others. It is endlessly rewarding.
As an acupuncturist, each and every patient presents with different problems, a different health history, different symptoms. I have to listen very carefully and try to decipher the root of their problems. For instance, if 5 people came in for headaches, they would most likely be treated in 5 different ways. It is like a puzzle and definately intellectually stimulating.
Then, I get the chance to put my training into practice and give a treatment. I've been doing this since 1999, but still, every day is interesting.
People usually only come to acupuncture after having exhausted their other options. Most people are not into getting stuck with needles, unless they've experienced it before. Most come with complex, difficult problems.
When they improve, it is incredibly rewarding. There is nothing better than helping people. It is not like work. I put in long hours, but I choose to do so, and it is not difficult, because I enjoy it.