GIMA - I can relate to so much of what you wrote. I've thought too about the strange mix of emotions recently as we hammered out and have begun to implement the agreement. Funny, yeah - the concurrent anxiety and relief, anger and compassion, etc.
And you're right, the only thing to do is to move forward. Let tomorrow come, and the day after that, and things start to become OK in increments.
Flowmom, we did ours over a number of sessions. Sure there's different formats for different circumstances. (We had a single mediator, did not bring our seperate lawyers, actually cut them out of the process).
Hang in there GIMA. Breathe deeply now that it's done.