I am sorry for your situation. It sounds bad.
I suggest you talk to friends and family to see if you could put together the resources to hire an attorney. If you qualify, you may also be able to find a local pro bono lawyer.
Why couldn't you get child support?
How many attorneys have you spoken to? This sounds like you have assumed you can't afford it. Get facts.
Have you discussed interim fees from him?
Have you contacted Houston Volunteer Lawyers?
Something is not right if you didn't get child support. You should ask friends and family to help with attorney fees, and you may be able to get him to pay some or all of your legal fees.
This answer DOES NOT establish an attorney-client relationship. This answer is based on the limited information provided and is not intended to be conclusive advice. There are likely other factors that might influence or change the advice after a more lengthy consultation.
Don't give up! You may qualify for legal aid, you should contact your local office to be sure. There may also be an attorney on this site who would take your case pro bono. Also, it is not clear why you couldn't get child support. A divorce filing would not prevent child support. Keep looking for an attorney and contact some on this site in your area to be sure that you can't afford it. Younger attorneys often charge less. Best of luck!