My boyfriend's mother had heart issues and needed ...

My boyfriend's mother had heart issues and needed to be transported by ambulance to Cox. She has been there since 12/19/15. We have tried to visit her multiple times. Each time we tried, they wouldn't allow us or even just her son see her. We have also tried to get information to see if she's at least okay or out of the ICU but the nurses refuses to tell us anything and called security on us when we mentioned that her son has power of attorney so he needs to know what's happening with his mother.