Nightmarebirth, I am so sorry you had such a difficult time. I can't offer you legal advice, but I want you to know that although I had a very different experience to you, mine was also rather nasty. Like you, I am also terrified at the thought of having another. See what you can do about getting some support and maybe counselling to help you through this. It is difficult, but it will help you deal with the many, many emotions that go along with a difficult experience like this. I am also following steps to try and address my experiences and it is really hard! Even so, following this up, standing up for yourself, and speaking out can also help the healing process. Just be aware that it is very emotional, and can be exhausting.
There is also the birth trauma website, the ladies on the forum there are amazing, and offer a lot of support. It helps to chat with them, and know that they really understand, as they have been through very difficult birth experiences themselves.
Sorry this is a long reply. Whatever you choose to do, I hope that you can find a way through this and heal so that you can enjoy motherhood, and face the prospect again with hope and positive thoughts.