super heavy period, please help

So normally my period is very light, to the point where I'll bleed for three days and my tampons come out 70% dry. My period at the Minute is so unbelievably heavy! I've been bleeding for 6 days straight and I'm bleeding all the way through my tampon and filling a pad in under 30 mins, I've gone through 50+ tampons and pads so far, as I have to use both in order to prevent it leaking into my trousers. I don't know what to do? Is this normal?