M.M.
First off, you live in Texas, you get Marital support (alimony) so don't sweat it, since you've been married for 10 years or more. Second, you will most likely get child support, unless he can fight you with some issues like Mental Illness, Alchoholism, or instability. The guy is not going to 'rewrite' the law. The judge will follow the law. I would also go to the Women's Crisis Center to find a lawyer through them. They have a list of lawyers who will help you. Tell the lawyer "I got your name through the Women's Crisis Center", the lawyer will understand.
Second, you can work daily as a substitute teacher with a Science Degree. Sugarland's School District needs tons of substitute teachers. It will enable you to work with your child's hours, without causing you babysitter problems. If you explain to the school district that you need to substitute in your child's school, no matter what course, they should be able to put you there. You can stay with your son and you don't have to worry about babysitter issues.
Hope this helps.