What Causes Persistent Severe Rectal And Vaginal Pain?

MY WIFE HAS SEVERE RECTAL AND VAGINAL PAIN SINCE OCTOBER 2010. SHE HAD A HIP REPLACEMENT IN OCT. 2010. SHE HAS SEEN A MULTITUDE OF DOCTORS AND HAD CAT SCANS AND MRI PROCEDURES., BUT NOTHING SHOWS UP. IN FACT SHE HAS HAD HER COLON EXAMINED , AND THE BOTTOM LINE IS THAT ALL THE DOCTORS CANNOT SE ANY THING.. CAN YOU HELP BECAUSE SHE IS IN SEVERE PAIN