Almost a week after her overdose, DEMI LOVATO is still in the hospital. Sources say she's suffering extreme nausea and a high fever, which are among the possible after-effects of an OD.
Apparently, this was a life-or-death situation for Demi . . . but she's expected to make a full recovery.
There's still no word what she overdosed on, but it must have been some sort of opioid, since she was treated with Narcan.