I dont really post anymore, but couldnt read and not say anything.
I am absolutely shocked at the way you were treated. It was totally inhumane, kafkaesque, terrifying. I am not suprised, however. I do understand how things enter this twilight zone once social services/mental health/police get the bit between their teeth, all in the name of "helping" people.
I would say though, the absolutely best revenge would be living and living well. Don't let them have the satisfaction of turning round and saying "see we knew she was crazy. We should have helped her more." Or giving them ammunition to section you again. You do not sound crazy to me.
Can you go somewhere warm? A 24 hour supermarket? Anywhere at all, take your laptop and dongle, and try and see if you can work out a way out of this mess. Sell the house, rent somewhere decent so you can have your kids back. I personally wouldnt try and sue people, I think it would backfire, but just get yourself THROUGH this as best you can. I know you are strong, heck you survived a living hell, you just have to be stronger a bit longer before it all gets better.
All I can say is Ive been through some hard times, just keep your darkest thoughts to yourself, keep on going, dont give them ammunition. Just legally claw back a life for yourself. Move forwards. Do it for your kids. A thread won't mean shit to your kids, but you there, thriving, absolutely will.
Keep on going, Daisy. Im sure with mumsnet's clever nest of vipers you can work out how to make it all work.