This is getting really sad!

Ever since Amanda Bynes was placed on a 5150 psychiatric hold on Monday, the actress has been under the care of medical professionals at the Ventura County Medical Center, and apparently the troubled starlet's behavior is doing little to dispel the assumption that she's mentally ill.

According to TMZ, doctors have already determined Amanda is suffering from serious mental illness with "schizophrenic tendencies," and is cognizant of the fact "there's a good Amanda and a bad Amanda." The "bad Amanda" causes her to bite herself and behave as if she was exorcising a demon from her body. Yikes!

Not only that, but the 27-year-old's erratic episodes occur after long stretches of seemingly normal behavior. The She's The Man star was doing well for a 10 hour period before she reportedly went nuts after learning her dog was in the custody of her parents, screaming, "They'll kill it, just like they tried to kill me." Miss Bynes was originally placed with another female patient, but had to be moved into a room by herself after insulting her.

Ironically, Bynes was extensively drug tested and everything came back negative except for marijuana.

The former child star's friend Ana Rivera, who lived in the same apartment building in N.Y.C., recently dished about Amanda's mental state leading up to her hospitalization, and it makes us feel really sorry for her!

    "She opened up, and it was obvious she had problems. It was immediately obvious she didn't have any friends. When I asked if she'd met a lot of people since she moved to New York, she said only me and another woman in her building," Rivera explained.

Rivera claims that the Easy A star was lonely, lost, and had difficulty forming bonds with others because of how bizarre her thoughts had become.

    "She has a hard time talking to people because she's so weird. She's all over the place. There is a lot of disorganization going on in her brain. She's literally only hanging out with her dog. Amanda desperately needs help," she added.

The pal also divulged that the reason Bynes wore wigs is because she burned all her hair off with bleach, and she abuses Adderall to stay skinny.

Before any of this information hit the web on Wednesday, actress Ashley Benson posted the shot below on Instagram and wrote, "Doing my Amanda bynes look this afternoon." However, the Pretty Little Liars starlet apparently checked her comments (and the blogs) this morning and apologized … and removed the image.

"To clear up the whole Instagram thing, I had no idea what her situation was. Truly sorry if I offended anyone," Benson wrote.

At least Amanda is in the care of professionals now!