should i go live with my mum?

im 14 and I'm currently living with my nan because of issues with my mum. She has gotten better and now I'm finally allowed to stay with her in another state, and if i were to go i would be leaving in 2 weeks. i have three siblings and only one would be coming with me. id be starting school (year 9) a week late, and starting a new school scares the crap out of me. i don't want to change schools, i really like the classes I'm going to take this year and the teachers and people in them, but i still want my mum. i just don't know what to do. thinking about living there sounds good but when i really think I'm actually going there i get anxious and feel wrong. i haven't lived with her since i was 10 and i want to be with her now because she's my mum, but theres thing down where i am that stop me from going? what the hell do i do?