The future is unwritten, bro. Hang tough. I'm just a couple weeks ahead of you at this point I think. Keep moving forward but allow yourself to feel and process the grief. I offer the following not to hijack your thread but to share what has worked for me in the hope that it might help you.
Once I got farther down that road of accepting her decision (it's a process, not an event!), and accepted that I didn't agree but that it was beyond my control, my days got better.
Signing the papers wasn't as difficult for me as I feared. Took 5 minutes in the same lawyer's office who handled the closing of our house (heh). I did shed a few tears on the drive home.
My XW came with the movers the day after signing. I made plans to get out of town immediately after they left last Fri morn. I went out to the restaurant where my son works and had lunch and talked with him until the lunch crowd arrived in force. Then I hit the road and spent the day with my parents who live a couple hours north of here. The next day I went farther north to my hometown and spent the weekend with various friends I reconnected with at our recent HS reunion, and also with my brother who is also headed for D.
I can't say I felt great the entire time, but I felt better than if I'd been spending that time mostly alone. And it helped me keep my orientation forward. Life is moving us forward regardless of our wishes, but we can plot our course and do our best.
I wish you nothing but the best. Sounds like you've come a long way. Your future is bright because of all you do have, your good choices, and who you are.