(CNN) Convicted rapist Harvey Weinstein fell sometime Sunday morning while at Rikers Island jail, his spokesperson Juda Englemayer told CNN.

Englemayer said Weinstein was dizzy before he fell.

"Harvey says his head throbs all the time and thinks he has a concussion. He has not been officially diagnosed," Englemayer said.

Englemayer, who spoke to Weinstein by phone Sunday evening, says Weinstein has "had a lot of time to think about his life and what he's done," adding, "He said he wasn't a nice guy and that's how he got here."

Movie mogul Weinstein doesn't walk steadily and doesn't have a walker in jail, Englemayer said. During his recent trial, Weinstein used a walker to get in and out of court.

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