updated 12/06/2009 AT 5:15 PM ET
•originally published 12/06/2009 AT 10:15 AM ET
Following Alexa Ray Joel’s hospitalization Saturday, sources tell PEOPLE that the singer may have been upset over a boyfriend.
According to a source, she took Traumeel, a homeopathic medication. “She became worried about breathing, which is why 911 was called,” says the source. Adds another source: “She was apparently distraught over an argument with her boyfriend.”
The singer has been released from the hospital and her father Billy Joel is now with her, says a source.
Being prone to emotional highs and lows was nothing new to the singer – and she spoke candidly about her frustration with relationships.
In August, the singer took to her MySpace page to vent about relationships, writing, “UGH!!! MEN!!!”
She continued: “Is anybody else finding it a difficult "dating world" out there? I’m so terrible at dating – I don’t know if I’ll ever get used to it! And I HATE the game-playing! Can’t stand it.