I know you are sick, so don't reply right now, but child support isn't supposed to cover that stuff. It's to cover housing, clothing and feeding them. E erything else is additional and should be split.
You wouldn't expect to pay their college tuition just because you got child support, right?
My ex pays the insurance so that is factored into support and all co-pays, prescriptions and the like are pro-rata split. Same with child care costs. All school and sports we pay 50/50 because that's not supposed to be covered by child support. I seriously suggest you talk to your attorney. You've got a lot of years of this and a lot of medical expenses. These are his kids too and it's not just your financial responsibility. Don't unduly burden yourself. That's not fair to your retirement, your financial stability or to your kids. Your economic health affects them too.
Me: 42/H: 37 T: 10 years/M: 8 D9, S8 Bomb: 7.23.07 Separated: 1.20.08 D Final 3.19.09 Affair started in '05, found out parts in 11/07. They married 11.26.09