Just when you thought it couldn't get any worse on the war-torn set of "Grey's Anatomy," Ellen Pompeo blew up at a badly shaken crew member, say sources.

Ellen's meltdown came just days before co-star Isaiah Washington's headline-making gay slur at the Golden Globes.

And insiders say her outburst shows how the enormous stress levels on the set are laying waste to the ABC medical drama.

The ENQUIRER has learned that 37-year-old Ellen screamed at a technician in charge of "continuity." He is assigned to photograph the set between takes to make sure that objects are not moved. At the time, the show was filming on location in the parking lot of California's famed Santa Anita racetrack.

"Ellen totally freaked out at this crew guy while he was taking pictures of the set," an insider told The ENQUIRER.