Does anyone else feel really faint on their period?

I used to get long, kinda heavy periods with bad cramps. Once I was sitting in class and then I passed out, so my mom took me took my doctor and she put me on a low dose birth control.
I've been on it for a year and it kinda helps but I still completely lose my appetite, get nausea sometimes, and I feel like I'm gonna pass out.
My cramps aren't as bad though.
But does anyone else feel this way? I'm not anemic, but perhaps I am when I'm menstruating?
I just took a multivitamin with iron in it, trying to see if it will help. Even when I sit down my head still swims.

Another question: when I start by sugar pills, it takes two days for my period to start. It used to start almost immediately. Is that a bad sign?
Does anyone else feel really faint on their period?
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