Hi.
I haven't ever been in foster care and have had stories of really great foster parents and ones that are horible so I know it can be isolating and horible if you're alone like that. Because I'm living in a residential facility for people with mental illness caseworkers really do come and go and that can also be really hard. I've found it's important to find someone really stable. For awhile that person was the clinical director who also did therapy with me. And my best friend and I are stable supports for each other. Plus I have a lot of online support.
Geting a good therapist or counselor or someone you know isn't gonna be tempoary might help. Hugs. I'm glad you had the courage to reach out here.