Well, as someone who has been there - recently....

First, I don't ride while on my period. I found that the exercise only increased the bleeding. I do low energy yoga, mostly restorative poses, no inversions.

Second, I had uterine ablation. It did not stop the bleeding completely, but now I go through 5 days of light spotting, instead of 7-10 days of heavy bleeding (1-2 boxes of tampons a month) each month. I am no longer anemic. Down side, be sure you never intend to get pregnant again. Seriously. This procedure cauterizes the lining of the uterus. I'm happy with the results. It's drastic, but worth talking to your doctor about.

Finally, be good to yourself. If you are bleeding that much, and the pills aren't working it is trully time to have a serious discussion with your doctor. Eat right, rest, and be good to yourself.

Best wishes, Mikki