Troubled singer Rihanna performed a rescheduled concert in Sweden last night, 48 hours after seeking emergency medical treatment at a hospital. The 23-year-old Bajan reportedly experienced dizziness and nearly collapsed during rehearsals for a concert in Sweden on Monday. She was rushed to a hospital where she was hooked up to an IV and given fluids to rehydrate her.

As we reported previously, a source close to Rihanna’s camp reached out to Sandrarose.com months ago when Rihanna’s drinking and drug use was getting out of hand.

“Rihanna is running on empty but she’s still been going out drinking and living it up,” a source told London’s The Sun publication yesterday.

Shortly after she tweeted a photo of herself receiving an IV infusion on Monday, Rihanna’s camp released a statement claiming the “Cheers” singer had a bout of the flu and she was hospitalized for “extreme exhaustion.”

But there is no such medical diagnosis as “extreme exhaustion.” That is a terminology usually used to mask the real reason for a hospital visit.

Meanwhile, Rihanna’s boss, ‘X Factor’ judge, LA Reid, reached out to his troubled star with text messages and flowers sent to her hotel. Reid, the Chairman & CEO of Epic Records, is catching flack from industry sources who say he still isn’t doing right by his former friend, Shakir Stewart.

On Nov. 1, 2008, Stewart put a gun to his head and took his own life in his bathroom, just one day after flying home from New York to take his children trick or treating. He was 34.

On Nov. 3, 2008, several top recording industry executives reached out to Sandrarose.com to blast Reid for refusing to pay Shakir’s funeral expenses.

“They weren’t just co-workers, Shakir and LA were like father and son,” said an industry source.

Reid finally saw the error of his ways and paid Shakir’s funeral expenses — but not out of his own pocket. “He got the record label to pay the funeral expenses,” said a family friend.

Industry sources say that 3 years later, Reid has yet to reach out to Shakir’s fiancee and two children. “He doesn’t call her or keep in touch,” said the source. The source named a handful of industry friends who still keep up with Shakir’s kids, including Shawn “Tubby” Holiday, Sr. VP of A&R at Sony. (Holiday, pictured above with Shakir’s family, declined to comment for this post.)

The loss of Shakir’s substantial income forced his family to move out of the $2 million Marietta mansion they called home. There was no insurance policy, but Shakir’s fiancée, Michelle Rivers, comes from a family that is well off, according to friends.

Reid, who was CEO of Island Def Jam Records at the time, was under pressure to produce hits for Def Jam, and friends say Reid put the blame for his failures squarely on Shakir’s shoulders.

As a result of the stress, Shakir stayed away from Def Jam’s New York offices increasingly in early 2008. He began receiving harassing phone calls at home in Atlanta from Reid in New York, according to the source.

Reid accused Shakir of staying in Atlanta “chasing girls” when he should be in New York signing new acts, said the source. The strain intensified when Shakir was appointed Executive Vice President of Def Jam in June 2008.

“When Billboard wrote that article naming Shake the next Jay Z, that’s when his problems really began,” a family friend told Sandrarose.com.

Shakir complained to friends that L.A. was preventing him from doing his job. “I need my own team. L.A. won’t let me bring in my own team,” the source quoted Shakir as saying.

The pressure caused Shakir to spiral into a deep depression. By the time he committed suicide, Shakir was dependent on the sedative Ambien to help him sleep. No street drugs were ever found in his bloodstream, according to autopsy results released to the family.