Hey Rick... it's ok to grieve the loss of your R. It's only natural and don't beat yourself up over it. Accepting that you have no say in the D is a good step... it's like accepting that someone has died, we have no say in that either.
The lonely thing is tough but you're right, you've been there before and made it. And consider that all the energy you've been pouring into keeping even the small level of detente in place with your W won't be needed. You'll be able to take that energy and put it towards things that support you and your daughter.
Married 6 together 8 Me:38 W:31 second marriage for both SS12, SD10, S6 Bomb: 9/8/11 (day before our 5 yr ann) W moved out: 2/18/12 D final: 11/12/12 Share S 50/50. Spend as much time as I can with SS & SD