Dear cheekyminx,
It depends on what causes them and what your major complaints are. I always had periods that were lovely emotionally, so people's suggestion for Moonstone didn't do much for me.
However, I'd lose a lot of blood, and yes, also over 7 days or more, leaking through 3 pads during the night sometimes. My gynecologist was kind enough to check it out. One of the reasons I had such a heavy menstruation was that I had a very small uterus wall lining, so my body would try very hefty movements and scrape it continuously completely clean, causing so much blood. I do suggest you go back and demand that they check what is going on. There are several things that could be causing it. Including early menopause.
In the end, my menstruations have leveled off, I have very little problems now. I went to a physiotherapist that specializes in that area, and she helped increase blood flow and relaxation. It took me at least 8-12 months.
My sister *also* had heavy problems, not with blood loss, but with heavy cramping. I send her to the same specialized physiotherapist by recommendation. 6 months later she is almost complaint free, so she doesn't have to take pain killers several times daily during her period. Once one of her clients told her she should go home, as she looked so drawn and white (during her period) and she must be very sick.
I'm not sure how to translate the type of physio in English, sorry. They also help pregnant women after pregnancy if the bones/muscle structure gets damaged.
If your problem is also relaxation/blood flow, I'd suggest you use carnelian or something like it to help you ease through it at first.
Hope you find what helps you, and find a doc who is willing to take you serious!
Love,
Kahlie