This is a no-brainer. Consult with an experienced TX personal injury/trucking accident attorney immediately. You will never receive fair value for your injuries without one and may in fact jeopardize your case by trying to.
I am sure that you can find an attorney who will handle the case on an hourly basis at say $3-400 per hour. However, this would NOT be advantageous to you, because the attorney would not be invested in the case. If you lose the attorney, loses nothing. You want your attorney to be in the same position that you are, that way it maximizes the chances that you will be on the same page.
The reason is because there are parents out there who would abuse their fiduciary responsibility to their child and take all there money and the only way to protect children against such actions is to only authorize its release in extraordinary circumstances.
Its a little late for the realization that you need an attorney. You did your child a disservice by trying to handle this yourself. Depending on the small claims rules in your state, it might be possible to get a trial de novo.