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I'm not sure how an ex parte motion plays into this since ex parte just means "without notice" and would only get you a temporary order at best.
You definitely should have filed an Answer to his motion if for no other reason than preventing it from being a default judgment if something happens and you can't make it there. However, you can still file that and you can file a Motion for Continuance and explain the circumstances to the judge and ask for additional time to get a lawyer. You may also want to mention about the actual time limit between being served and the date of hte hearing.
You can ask the District Attorney's office to file for a protective order for you, they usually will do this if there are children involved or if there was physical abuse in the past.
If you have the hearing tomorrow, either because you don't file the motion or because the judge denies it, then you can mention to the judge that you had indicated to him that you were amenable to lowering the child support to an amount that is according to the guidelines and based on your oldest no longer being at home.
You may also want to pick up a book on objections like the ebook at http://www.lessonsinlaw.com/the-guerrilla-guides-to-the-law/the-guerrilla-guide-to-trial-objections/
That one is both inexpensive plus very good.
If your question has been answered then I'd offer my best wishes to you and ask that you please not forget to leave a Positive Rating so I receive credit for my work. Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered.