I'm sorry you're going through all that. It's hard to deal with those problems on top of all the other issues you have to deal with. I agree 100% that parents should not use their kids to get back at the other parent. You have a right to see them when you want. Have you guys tried marriage counseling? Or is it past that point? Whatever the case I hope things work out in your favor.
Marriage... for better or worse they say.