Yes, definitely get yourself an experienced immigration attorney to advise you, and do it before you make a plea on this offense. His advice might change your mind on the plea.

And by the way - don't drink and drive any more. You put yourself and everyone else on the road in mortal danger when you do, which is why it's illegal in the first place. Call a cab, go with friends and designate a driver, or buy some booze and drink at home, whatever you have to do, but don't ever touch the sauce when you know you have to drive home later.