I would respond by seeing a lawyer ASAP and finding out how you can go about seeing your kids more often, and in the meantime, I would agree with your W about NOTHING regarding the terms of the separation/divorce.
My response would be limited to the car seat question only.
Can you see now that trying to be nice and give her one more chance is not getting you anywhere?
Please get a lawyer and take immediate action (whatever that may be) to spend more time with your kids, and stop considering what your W will think or whether you can still R.
me: 44 XH: 42 M 11 years D10 and S8 Bomb drop 9/27/13 D final 7/1/14