Insurance with child support

So I have been paying $300.00 a week for the last past 2 years since me and my ex wife split. Me ex lives in another state then I do. I see my son as much as I can currently considering I pay almost 300 a week for child support and half of daycare. I only gross 60k a year, so this slowly killing me. I a, trying to keep afloat with bills and support working almost 60 hours a week. My ex had insurance for my son through the state until now cause the state finally realized she has a job. Everything we agreed on by a lawyer and now she wants me to pay an extra 120 a week for my sons insurance. I told her to go through the state for child support and I would get him insurance due to I might switch jobs and at least all will be fair to both of us cause honestly after speaking with serveral people I am paying to much. So after me telling my ex this she has not let me talk to my son and canceled a trip for me to get him for thanksgiving
I am heartbroken and don't know what to do
I don't have an extra 3000 for a lawyer so I really need some advise for anyone that can help me
Out of options