My dean hates me, help?

I know you probably think that its not true because lots of people say that teacher dont like them but this is real. Last year the dean was also my teacher for my freshman honors history class and she absolutely HATES me! Proof: My grampa (who I was very close to) died and I had to miss her final exam to go to his funeral and she flipped out and was screamin at me so bad that another teacher had to step in. More Proof: I got a concussion in a softball game and the school sent a letter to all the teachers saying that I might have problems in class and she screamed at me for having a headache! the whole year she was like this she made my year hell and I ended up with some real problems. I have to go back to school soon what should I do? My parents are putting heavy pressure on me and if I dont get straight As and have a perfect record this year they are going to send me away to a horrible school but with this dean I cant control my temper she makes stuff up and if she calls my parents or puts ANYTING on my record im DEAD! somebdy please help! im so stressed and I dont know what to do!