[Coffee.]

I would try to take some painkillers before school, and either take some with you to school (if you are allowed) or go to the nurse to get some throughout school. Honestly, where I was from you weren't allowed to have them on you, but they weren't strict about it because they knew they weren't dangerous drugs, and that women have their needs. I'm also not sure if this is everybody, but my cramps go away when I sit in almost a fetal position. This isn't possible in class, obviously, but maybe if you are allowed (and small, like I am) sitting in your chair with your knees to your chest might help. I don't know why this helped me, but it always did.

I'm also going to give you our Guide to Menstrual Cramp Relief sticky. Many of those may not be able to be used at school, but you might get some ideas from it as well. Good luck!