Thanks guys. The feeling was more than empathy which I tend to think of as understanding another's pain, or sympathy (feeling bad about someone else's pain) I was actually feeling it. The other times I've felt the same were when my children were having problems. You know, "You can only feel as happy as your least happy child"
I guess I've come a long way. One of the first posts I read on this forum was a woman writing about holding and comforting her SO who was heartbroken over an OSO. I couldn't understand it at all. I thought I'd feel glad.