You should contact the local bar association in the county in your state where the case was filed. It is possible that the bar association has criminal defense attorneys willing to take a case on to review it and to see if the plea can be set aside. It is critical you speak to a local lawyer soon as there may be deadlines involved to attempt to withdraw a plea. Not being from your state, I would not be able to give you specific answers but you should contact local lawyers in your area for help.
Best of luck.