Bleeding and/or discharge 3 yrs. after a complete hysterectomy

Hi! I am looking for HELP and solutions! I am 47 and had a complete hysterectomy in Jan. 2003. My hysterectomy came after a diagnosis of breast cancer (Oct. 2001) and months of various treatments to stop the 7 x 24 bleeding. I have since the hysterectomy continued to have irregular spotting. Within the last few months, however, I am back to 7 x 24 bleeding ranging from spotting to heavy and unpredictable gushes. The color also varies from bright red, to light red, reddish-brown, yellow, to clear with a tint of red/brown. Periodically, I have mild to moderate cramping. Four ob-gyn drs. and one emergency room dr. have not been able to find the problem, give a diagnosis, or suggest treatments. I cannot count the number of pelvic exams and ultrasounds ... I do have my first MRI on Dec. 6. Is there anyone out there who has experienced this or something similar so I have a direction to pursue for a cure? I so appreciate your willingness to share. Thank you.