Help, please.

Is it normal to get horribly sick when you’re period comes? I have seemingly unbearable stomach problems(diarrhea sorry Ik tmi) and the cramps I can barely handle, I get extremely dizzy and somewhat nauseous at times and I can’t tell if its from the pain or something else. My muscles get extremely tight and It hurts to do anything at all, even reach for water. Another thing is more recently I’ve had these “incidents” where I was stuck on the toilet for an hour because my bleeding would just not stop, like it was everywhere when I tried to get to my bathroom and I spend quite a long time cleaning it up after it slowed down). Another newer symptom is I have gotten bad cramps WEEKS before my period occurred. My parents say I’m just overreacting and theres nothing wrong but Idk, so is it normal to be like this?

(Edit: I forgot to mention the relatively intense dizzyness is somewhat new, and the cramps WEEKS before period is somewhat new, and the intense bleeding is new)