It's getting worse for Dwight Gooden ... the MLB legend was arrested for DUI in New Jersey on Monday night after cops say he was driving the wrong way down a 1-way street.
The 54-year-old former Mets pitcher was pulled over around 11:10 PM in Newark, according to the NY Post ... which reports Gooden was a "mess" during the stop.
Gooden was reportedly taken to a nearby hospital for treatment -- though it's unclear how he's doing now.
The arrest comes just weeks after Doc was busted for cocaine possession in Jersey.