cramps? how bad is it supposed to hurt? Options

[HaN4RaNg]

sometimes out of randomness, i'll start getting the most excruciating pain down my lower back, lower and upper stomache. sometimes its like a deep sting that lasts for only a few seconds, and sometimes its a very long steady mild pain. but either way, it makes me want to arch my back like crazy or go into a fetal position. but when i curl in my stomache into the fetal position, my stomache burns heavily and i eventually have to sit straight up again. sometimes i cant even sit, i have to stand or else my lower back hurts. is this normal? it usually happens around the week before and/or after my period but i never hear of girls having this much pain! sometimes i even have to excuse myself out of school cause i cant concentrate on my work and it hurts so bad. i'll start getting really heated and sweaty and breath heavily. does anyone else experience this with cramps?