"It's been a rough weekend," says a source. "She has not been able to sleep and has barely been eating. All weekend, Lindsay kept crying, chain smoking and chewing her nails."
Lohan, 24, has been staying at the Pickford Lofts sober living facility in L.A. for almost a week and has had frequent visits from ex-girlfriend Samantha Ronson, mom Dina, sister Ali and other pals, but even all the company hasn't been able to ease Lohan's anxiety.
"She is a nervous, fidgety mess, and her legal team, family and friends are very concerned about her fragile state," the source adds.
While the troubled actress seemed to be coming to terms with her situation last week, according to sources, friends now say the scary reality of spending time confined to a cell has set in.
"She's been picturing herself in jail and she can't handle the idea of it," says another pal, who just last week said Lohan was feeling better. "She doesn't want to go. She doesn't think it's safe. She doesn't know how she'll make it."