From The Dictionary of Obscure Sorrows:

Watashiato

n. curiosity about the impact you’ve had on the lives of the people you know, wondering which of your harmless actions or long-forgotten words might have altered the plot of their stories in ways you’ll never get to see.

One of the most beautiful and terrifying things about medicine is how much you can affect a person’s life. When medicine is done right, it can be a wonderfully healing and inspiring experience. Illnesses cured, health restored, hope recovered. When medicine is done wrong – and there are so so many ways where it can go wrong – the result can be catastrophic.

It is a cause of much anxiety and hope.