It seems like a serious problem. With all your blood loss, you could very easily get iron-deficiency anemia. You are having to change your pad too often. It sounds like you are getting closer to menopause because of the length of time between your periods and the heaviness.
Because of your age and extreme blood loss, I would recommend that you take some gentle iron supplements and get in to see your doctor right away, or even go to the ER. Here is a few links:
http://womenshealth.about.com/cs/uterinediseases/a/veryheavybleedi.htm
http://www.ctds.info/menorrhagia.html
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