School, Seizures, and Sleep

So I have JME and have seizures when I'm sleeping. I don't wake up after them, but in the morning I will have realized that I had a seizure because I had peed my pants/bed. Sometimes the headaches and nausea doesn't come on till later and so I'll go to school. But then they'll come and I can't focus or type and I'm just dizzy and out of it. Almost like I'm on drugs. So the nurses at my school said that I can go home with an excused note if I get a doctor's note. I always do. But this morning I went in for a persistent headache and she told me that they can't do that anymore because she talked to my doctor and he said to just to go back to class. We have a new principal this year and my grades aren't terrible (two C's) but sometimes I'll have trouble turning things in. When I do have a seizure I usually go back to sleep and get back the sleep that I had lost that night and I'll eat some junk food (it's the only thing that makes me feel less nauseous). It's really frustrating because I was diagnosed a year ago and if she wasn't allowed to do that then she should have told me then instead of sending me home. Besides wouldn't it be better for me to go home and rest than to stay at school with my brain exhausted and tired without missing any classes? If someone could explain or agree that would be awesome.