I'm quite lost

Here some background-

I'm 17 and I live alone. the reasons behind this are my step mum was abusive and camhs told social services but my mum wouldn't let me live with her because she fosters. She said I could share a bunk bed with my 7 year old sister but her room is shared with her half brother. So of course I declined- either way that's illegal here so my mum changed her mind anyway.

Anyway she said if I moved out she'd help with school and stuff. She hasn't even contacted me since I left except once to say I'm not giving you help to get to school you can't expect me to do everything.

She does nothing AT ALL. I'm not even just saying that. Anyway the stress of school (two trains and a bus away) and the stress of not having enough money or food is genuinely eating me alive.

Since living alone I've Been constantly pestered by my mental health person about having an eating disorder and stuff but quite honestly. I'm so unhappy i don't want to eat.

I feel so so lost and alone- I know I don't have it as hard as some people but can anyone offer some advice?? How can I not

Feel lke I'm drowning in worry alone ahah. I have no family except my 7 year old

Sister so that's not an option.