i got upset once because i got dumped by someone i was about to dump and i felt extreme rage which was physically bad but i got back at them...
anyways, i've actually had my "heart broken" in a manner of speaking, and it feels like i just don't care about anything. it feels like i can't even be suicidal because that would take too much effort and thought. everything feels like so much, and yes, you do actually feel physically hurt... haven't you ever heard of emotions causing physical pain? sadness, stress, all these things can trigger physical ailments.
for example, i pretended i had a cough twice in my life as an experiment entirely where i coughed and pretended to have the ailments 2 days later i was sick as a dog.