Your wife can not force you t pay child support under the circumstances. If she is collecting the support through the state you need to contact the agency and let them know your circumstances
You are not entitled to public assistance. However there are non profit organizations that may assist you. Contact Catholic Family Services, Lutheran Social Services, your local law school may have a clinic, Legal Aid.
If you are low income go here: www.justice.gov/eoir/probono/states.htm or http://www.immigrationlawhelp.org/
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.