try this http://locate-lawyer.info/ you tell them what the prob is, they'll send it off to their lawyers who might or might not get back to you with a quote.
You then decide who to go with.
It's free till you choose someone, then obviously you pay whatever it is they quoted.
Unless it was a mistrial, you cannot get a retrial of your original case. If you believe that there was a mistrial, then your current legal representation would have to file with an Appeals Court. This does not mean that your entire case will be re-heard however. It only means that the portion of the case which was wrong will be looked at.
Another option at this point would be to see if you meet any guidelines for modification of the existing decree. I am unsure what you are attempting to change, so without further information I cannot tell if a modification would even work in your situation or not.
The best thing you can do if you feel you were wronged or have need for a modification of some sort, is to speak to a licensed attorney in your state to see what sort of legal processes there are to help you.
You may also want to do some research on DadsDivorce.com on the subjects of what you are looking to change to see what they might have to say. They are a free resource website for men facing the various issues associated with divorces, both beforehand, during and after. There is even an Ask a Lawyer section that you could ask this question in to see what they might have to say. I would like to suggest that you give a bit more detail in your question to them so the attorney will know exactly what you are attempting to achieve.