I And then I think of my kids, and how I miss them, and how I worry we are already drifting apart. And I can't feel anything other than deep sorrow about it right now. I have them this weekend, and I am going to live it to the fullest with them. Adjusting to single fatherhood is going to take time, and it's really something I am struggling with. I feel shut out of their lives sometimes... but that's a very passive, victim-like role to take.
How much time do you get with the kids? If it is less than 40% and you feel you are drifting apart from your kids, why are you not negotiating for more time with them?
Get as much personal work done when you don't have the kids and when you do have them dedicate a LOT more time to them without distractions. That way even if you have them for only 40% of the time, you can effectively still spend 60-70% of the time you used to spend with them when they lived with you 100% of the time