I myself got heatstroke walking home from buying groceries one day. I was dressed in a nice shirt and shorts, hair brushed. No one stopped. I ended up having to call a cab to take me home maybe 2 blocks because I couldn't walk anymore. He charged me $5 for that short ass ride.
No one cares anymore. Being disheveled might increase your chances of being ignored, but they still don't care if you die if you're a well-dressed man...unless they think they can get something out of it.
Sorry to hear that! It truly shocks me sometimes how people can lack basic compassion. Best we can do is to try and help others when we can I guess!