Quoting
EA1070a
In the meantime, keep copies of all correspondence, his emails or texts and your replies, including and especially the documents where he's using this judge as a threat against you and keep your replies civil.
Ignore his threats and if he wants to take you back to court request that he be required to pay your attorney's fees.
Judges tend to get annoyed when a party runs back to court within a few months of reaching a settlement unless something drastic has happened such as a job loss.
You also mentioned healthcare expenses. Was reimbursement for uncovered medical expenses written into the order, and if so, have you been mailing him copies of the bills with a request that he pay his half? If so, keep all of those letters as well and send your demands return receipt requested.
Finally, it might behoove you to start working with the dept. of child support services.