As Angelina Jolie enters her third trimester, sources tell Star that the 32-year-old actress is plagued by a host of complications — including edema or swelling, gestational diabetes, fatigue and relentless nausea.

"Angie has gestational diabetes," an insider tells Star. "She found out about a month ago and has been trying to keep it under wraps. She's been seeing a nutritionist about it — frequently." In fact, she's had to drastically change her diet, which has not been easy, considering her history of food issues. At one point, as she grieved for her late mother, Marcheline Bertrand, her weight plummeted to 98 pounds. "She doesn't pay much attention to food," her brother, James Haven, admits. "But it's different when she's pregnant."

She's also dealing with painful edema — swelling caused by fluid buildup. "Her feet are so swollen that her shoes have gone up a half size at least," a source tells Star.

Fatigue is another problem, say sources, and Angie has had a particularly tough time since taking the kids to Texas, where Brad is filming Tree of Life. "She's constantly tired," says a source. "She's sick and irritable and feels heavy and weak."