my really awful periods

so i have awful periods. i have cramps that are so bad that i have to lay on the floor in child’s pose and they make me sweat and sometimes throw up. my periods are also irregular. last month it was a week late and this month it was a week early. i tried to talk to my mom about it but she said that it was normal. i really think that i need to go to the doctor but i don’t think that she’ll take me and i don’t know what i should do but i’m tired of feeling this bad