I don't practice in Texas, but I can tell you this: attorneys who sue doctors for medical malpractice typically will work on a contingency fee. That means they are paid a percentage of whatever settlement or court judgment you may receive. There's no need to look for a "pro bono" attorney. If you have a meritorious claim, there are many lawyers who will consider taking your case. Call your local bar association and ask them if they have a "lawyer referral service." If so, they can point you to a qualified local attorney.