I have my period and have been bleeding really heavy and losing lots of clots for 9 days now?

and I'm in a lot of pain and discomfort. I have a Doctors appointment for Tuesday but I am really worried about what could be the cause of this excessive bleeding. It's most likely to be the onset of the menopause because I'm 46 but have also been told that it could be a cyst or fibroids. Has any one experienced this or do you have any advice on any pain relief that I could take?