“Is bleeding through six or more "super" tampons in one day normal for heavy periods?”

I know many people have heavy periods, but I'm not sure what counts as normal in that bracket, and where it slides into dangerous menorrhagia. I was wondering if this is too much? My cycle tends to last 8-10 days and the first five are VERY heavy, 6 (sometimes 7-8) "super" tampons a day is pretty average, and I am borderline anemic. Is the bleeding the cause of this, or is the borderline anemia causing heavier bleeding? Do they piggyback off each other? Could it be endometriosis? It does tend to be painful, but I have a decently high pain tolerance and power through it. I prefer not to let it interfere with my life, but with how much I bleed it's almost impossible sometimes. My cycle started this morning and I'm on tampon number 6 in the 16 hours I've been awake. That's, on average, a tampon every 2.5 hrs, but the first three were within the first two and a half hours. I keep thinking this CAN'T be normal, but I haven't had any severe issues come of it yet. I'm under 25, so I doubt it's anything like ovarian or uterine cancer, and I'm planning to have a hysterectomy at some point in the near future anyway. I am not on birth control and will not go on birth control -- not at risk of pregnancy and not planning to be, ever, and not willing to deal with birth control side effects even if it might help the heavy periods. Should I go see a gynecologist to ask what's going on? I am STD-free, and I've only had one partner.