First, call your town welfare office and county social services, they will know who can help you. Don’t get discouraged, you will find that one person who knows what they’re doing and wants to help.
Then, try these online resources:
National Health Care for the Homeless Council
US Dept of Health and Human Services
National Coalition for the Homeless
Substance Abuse and Mental Health Services Administration
Please note: There are affiliate links in this post. If you click on one it doesn’t cost you anything, and I get a teeny weeny commission to help support this site. Seriously, if you are in dire straits, don’t buy that stuff, at least not new. Not a single thing I linked was purchased by me new, I got things at thrift stores and yard sales. Thanks bunches!