Period Problems

Hallie
Okay so my period is pretty regular. (about a 3 day window of when it will come) but every month on the first and second day i can barely do anything. typically i am woken up with horrible cramps and a crime
scene at about 4:30 in the morning. Once im able to clean up and get a S+ tampon in, i have about 20 minutes to get Midol or some sort of pain killer before the cramps get worse and the diarrhea hits. this lasts for about 2.5-3 hours. but thats not all. my bleeding is so heavy that i bleed through a S+ tampon in about an hour, sometimes less. is all of this normal? should i go to a doctor?