what can I say to a family member?

I recently had a situation with a gentleman who was a full code and in respiratory distress and an obviously enormous amount of pain. Because of various decisions by the family and the MD we couldn't get him enough analgesia and we couldn't help his breathing. I was upset by the situation and went to the med room so that no one would see me crying. The patient's daughter barged into the med room, saw me crying and walked out, but a little later, once I had recovered and was talking to her, said to me, "You know, I know you have a hard job, but maybe in a few years you'll develop a thicker skin". I didn't say anything. Now, what I wanted to say was, "I think that the fact that I care about my patients makes me a better nurse". Would that have been an inappropriate thing to say to a family member?