Go to Urgent care and get your health taken care of.... while you are there, tell them you are homeless and you need to find some where to stay.... they made have a list of places you can look into to stay for a few nights, if they can't offer any assistance in the community, ask them where you can get that information. If you are from the US, after your health is taken care of, Go to the Department of Transitional Assistance, (DTA) and ask for assistance there. That is where you get food stamps, etc....
If you truly cannot find any help through them, go to the police station, tell them your situation and they will have a list of places that have beds for the night.
I wish you luck and I do hope your health is checked.....