Very bad period cramps HELP!!

So over the past 3 years every time I get my period I get very VERY severe cramps. They are so bad that I get nauseous, feel like I'm going to faint and also have to stay home from school because they are so bad that I can't think straight. Do you have any advice of what to do?!? I have taken Advil and Tylenol but it doesn't help. Also my mom won't let me take birth control so what should I do?