OHMYGOSSIP — Kristen Stewart is in a bad place right now. Since news broke about her affair with director Rupert Sanders, the actress has  basically “living on” a dangerous diet of Red Bull and cigarettes.

“Kristen is a nervous wreck and existing on a diet of cigarettes, sugar-free Red Bull and the occasional bag of potato chips,” revealed an insider.

“She’s been hiding out at the LA home of a producer friend and is looking pale and worn-out. Whenever anyone tries to push her to eat even a small bowl of soup, she either claims that she’s just had something, which isn’t true, or that she’s nauseous and there’s no chance of keeping anything down.”

“Kristen is grief-stricken and has hit rock-bottom. In many ways, Kristen living off cigs and Red Bull is a way of punishing herself.”

Kristen has also refused friends’ pleas to see a therapist, said the source.

“Part of her just doesn’t want to feel better,” said the source.