Your ex must be struggling, financially as well to receive SSI support for your son with IDD, Intellectual Disability Disorder? http://www.medscape.com/viewarticle/782769

Well, has an eviction notice, been served, yet? With the couple of weeks overlap between that and your own disability case finalization, would seem you have legal rights to remain, until a sheriff arrives, at your door to ask you to leave. Maybe by that point, you'll have that cushion of financial support to pay the car insurance and get where you choose to go?