You do not need a lawyer to petition the Court to stop child support in Massachusetts. You will have to file a Complaint for Modification, and a Motion for Temporary Orders. Many people feel more comfortable with an attorney by their side, in case things get "sticky". You may hire an attorney just to appear at the hearing with you, and review your papers before you file. Please see the attached list for LAR qualified attorney's in Worcester.
This response is not intended, nor does it constitute an attorney client relationship. The answer given shall not be relied upon as legal guidance. You should retain counsel for legal representation, to provide you a more detailed and accurate answer to your question.