Mine do that for 2 days, but then vanish to next to nothing for 2 days and I'm done. ((I could never become a vegetarian, I live on spinach and steak for a few days)). 5-9 days of it, I'd be seeking help, too.
Something to consider:
Hormone Birth Control.
If you're ON it, you may want to go off of it for a few months (or change types). Generally, they have you go off entirely for 2-3 months to find out what your period is like without added hormones. If it lightens, then they switch types to try to find on that doesn't have a 'massive flow' side effect. OR have you switch to a non-hormonal birth control method (copper IUD, diaphragms, cervical cap, and condoms are your options if you need non-hormonal birth control).
If you're NOT on it, you may want to get on it!!!
Hormone birth control lessens and lightens periods for the majority of women. For some women, though, they make periods reeeeally heavy, and last for ages. So it's really finding out if you're in the majority or minority of women as far as birth control pills/patches/etc. go.
IF hormones lighten your period, you may want to consider a Mirena IUD. For women whose periods lighten on the pill/patch/etc, having the hormones right there IN your uterus tends to make them even lighter than when on pills or patches. ((Know: Mirena, just like BC pills/patches/etc. isn't effective for a whole month surrounding taking antibiotics. Paragard-no hormones- is... and sometimes people get confused between the two. A hormone IUD needs a backup method for the month following insertion, and during and a month after taking antibiotics))