Hi HammerToFall I am so sorry to hear about your situation. I am afraid I cannot offer much advice really, except to get the help you need in real life. I am mum to two kids a birth dd aged ten (quite a challenging child) and a four year old by adotion (who is currently, six months in) very easy to parent!
Agree with Jamfilter. I think Jam has really hit the nail on the head, that it is not personal and not a choice the child is making, but something that they are not really in control of.
I too think ... you need to shout loudly for some help - from your LA, or your GP, as starting points.
You've already talked to social services, about help and post adoption support etc but have not got an answer yet? Please go back to them and be clear about how much you are struggling. It doesn't matter if your child was adopted from overseas or domestic adoption or where in the country you are, you still need help and you will need to push to get it.
Have you been in touch with any adoption charities - like BAAF and Adoption UK?
I would even be tempted to go to my local MP and get advice how you can get help. If you read a few other threads on here (maybe start at the end of longer threads if you have less time) you will see a few others really struggling and some very good advice being given to them too.
Our county council are pretty supportive, I've had attachment advice and various short training courses in the last few months and I am currently just starting a new adoption course as we now have a son aged four who joined our family by adoption six months ago.
Are there courses/services/advice where you are? What do they say when you ask for support?
My dd (birth child) was a lot of work between age 5 and 7 and I found it very hard (although not as bad as you are describing).
I will share what I did but my situation does not sound anywhere near as hard as yours and my dd is a birth child so not nearly so complex a situation.
I sought help from my health visitor, she referred me to the schools link worker who refereed me to a course at school for social and emotional education. I was also referred to the Family Links Nurturing Course, which I found really the best parenting course I have ever done.
Courses are not the answer in themselves IMHO but can give us tools to know how to deal with the behaviour we find so hard. They can also very importantly put us in touch with other parents who are struggling/working through issues/have adopted etc.
Family Links Nurturing Course
This course is not designed for children ho joined their family by adoption but it is very good and I think is helpful for parents of all children.
It comes with a book called The Parenting Puzzle
However I must say that controlling this controlling behaviour is not the issue, it is what it means/why it is happening and how to move forward. I really think what jam says a lot of sense. I think that you need to get to the bottom of the behaviour, to work out what things mean and how to best find answers for your child.
I hope you will also find support for yourself so that you can be helped and encouraged. Are you parenting alone? Can you get out in the evening once in a while to chat to friends, for a cuppa or whatever? You do need to look after yourself while you are going through this, and to have hope you will come through it with help.
Bless you and good luck getting support and answers.