For me, empathy with negative experiences usually manifests itself as anxiety, faster heart rate, even a feeling of panic as my brain imagines or remembers being in a similar situation.
My empathy can relate to anything - I get it when one of my friends has to have their dog put down; if a friend loses a parent; if I imagine how Mr H must have been feeling at our RTA, or if I see an ambulance - that relates both to our RTA and to watching my father taken away in one (he survived); I get it when someone has a disappointing experience, one that I could easily have had. It has differing levels of symptoms depending on the context but it nearly always feels unpleasant. (You probably noticed that I mentioned the loss of a dog before the loss of a parent, because it happens more often; and I've experienced the former three times, and the latter only once).
I now realise how many things on social media are liable to trigger this empathetic anxiety, and it has made me even more determined to do my mental state a favour and stay off it.
Lazlo and his brothers and sisters.