A Great Neck medical office building was evacuated Friday after workers there began feeling dizzy and nauseous.

Workers called 911 around 11:40 a.m. Nassau police, firefighters, a hazmat team and the fire marshal’s office responded to the office at 310 East Shore Road.

First responders evaluated dozens of workers who complained of dizziness and nausea.

“I've been in this building for 24 years and this was the most scariest moment of my life,” said Jeanine Marco. “A very bad headache, a little lightheadedness and nausea, carbon monoxide symptoms.”

Police say four people asked to go to the hospital for further evaluation.

“Fifty-five people were evaluated. No clinical signs of any significant readings were found in any these individuals,” said Nassau Police Detective Michael Bitsko.

The fire marshal’s office said it conducted a thorough search of the building but no hazardous gases were found.

“Hazardous materials is a science but it's not necessarily always an exact science,” said Nassau County Assistant Fire Marshal John Priest. “We checked for everything we can check for.”

The fire marshal gave the all-clear for workers to go back inside the building shortly after 2 p.m.

“They didn't find anything, which is a good thing, but it's always a question in your mind like why didn't I feel good?” said Marco.

The fire marshal says the building owner will be hiring an environmental company to run more tests in the building to try to find the source of what made the workers sick.