Just a few words here. So you know, mediation, D, papers signed and all the rest will not be the end of your suffering and your spinning. It will still be there afterwards. Read some of the vets' older posts from years ago. You'll see what I am talking about.
It sounds to me like you're hoping this action will terminate all your pain.
It won't. You'll still have to process all the pain, you simply cannot skip that step. There is no shortcut, there is no quick fix. You MUST go through it - like all the rest of us.
So - knowing that, knowing everything will be exactly the same emotionally, D or not, knowing how conflicted you are and how angry you are and sad that you are, knowing how badly you want to try to make this work, or at least be given the opportunity to try, I have a question for you.