another bad day

What another crap day,kids were arguing all day then my daughter was saying shes going to move in with her dad because she cant stand living with her brother and me.As usual ive done nothing wrong but she sais i always take my sons side(i dont) so again everything was my fault.I really cant take much more of this,also i am angry at stbx cause all he sees is them when they are on best behaviour.Its also been 18 days no contact and i am sometimes finding it hard especially when im having trouble with the kids,its so hard knowing i cant turn to him for support.Had my friend talk to my daughter on the phone as i couldnt stop crying.when will things get easier?He has no crap to deal with.