DUIs generally do not give rise to inadmissibility to the United States, however, you may be questioned and detained regarding any arrests upon return to the US. Also, you must make sure that you are not violating your probation by leaving the country.
If you have a conditional green card, you will be required to file for a waiver of the joint filing requirement to remove the condition. if the card is already permanent (ten year green card) then the divorce will not automatically affect your green card. Please consult with an immigration attorney for additional information.
Even if the calculation is correct that the 5 years are up, you may still have options to pursue your permanent resident status through an offer of employment from your company. You should consult with a qualified immigration attorney as soon as possible if you are not satisfied with the information you are getting from your company.
There is no "form" that person can file to take a green card away from an ex-spouse. If some other action has been taken against your green card by the USCIS, then you should consult a US Immigration & Nationality Law attorney as soon as possible to discuss your options.
The US Immigration courts are creatures of the Immigration & Nationality Act, created by Congress and operating under the Executive Office for Immigration Review, an agency of the Department of Justice. US Federal Courts were created by the US Constitution and are a separate branch of government from the Executive and Legislative branches.