You cannot stop child support unless you are found to be physically and/or mentally incapable of working. You can, however, possibly modify your support downward.
For free (or reduced) legal assistance, visit the list of organizations provided by LegalAid-GA. I've provided a link below.
I hope this information helps answer your question(s).
~ Kem Eyo
The above answer is a general explanation of legal rights and procedures. It does not constitute legal advice. Nor does it establish an attorney-client relationship between the individual posting the question and the attorney providing the answer.