A source told TMZ that Lovato is battling extreme nausea and a high fever. According to the site, her close circle has not approached her about rehab due to her health. According to Extratv.com One insider said, “We just don’t know where her head is at.” Though doctors haven’t approved her hospital release, another source close to Demi said, “She is under the care of medical experts and is expected to make a full recovery.