You should search the lawyers on Avvo that handle defamation cases or you can google defamation lawyer in your state and call a few until one is willing to take the case on contingency.
Click on name or picture to see profile page.
You don't say enough about your case to know whether this applies, but you should be aware that Texas has recently enacted anti-SLAPP legislation, the Texas Citizens Participation Act, which is effective now. (See http://www.citmedialaw.org/legal-guide/anti-slapp-law-texas )
You should immediately consult a Texas attorney to determine whether your lawsuit may run afoul of the new Texas anti-SLAPP law. If so, you should either dismiss or amend to fix that problem.