Hi MissFenella sorry to hear this.
This topic interest me, not because I am any good at parenting but because I have seen the 'naughty ?challenging' behaviour myself! I have a DD aged 8, a birth child, and my hubby and I are going through adoption process now.
I wondered, are the behaviours part of your child's problems from the past or the personality/fears etc that make them up?
If so the behaviour might be a chance to redress some of those things.
I will give you an example which might not apply at all to you but does in our family.
My DD is very sensitive so when things go wron,g or she is naughty, she gets totally upset and behaves badly, but actually as well as a consequence she also need to be reassured that even though I am unhappy about the bad behaviour I really love her.
I know we all probably do that to some degree with kids but for whatever reason my kid seemed to need that more than most. Once I worked that out I could manage to make the whole thing a lot less stressful. I am just offering that as one possible thought which may not apply to you at all.
Please feel free to PM me or ask me more if you want to.
All best wishes, it is hard but I also agree with other that it is just keeping going!