Help, my Mom is mad at me , i dont know what to do. Help, Quick?

Help. I'm a 12 year old boy and my mom is mad at me. It happened like this. I was due to a friends house but when the time came, my mom suddenly said i had to do H.W. I have like 2 weeks of holiday left and i didnt think it was fair. I wanted to do it tommorow. But my Mom didnt let me. I got angry and threw things around and acted mad. Then she like took all her things and locked herself in her room. She seldom does this and i'm worried. She has high blood pressure. I'm so ashamed now and i tried to find the H.W and do it, My mom usually keeps my H.W. i'm so worried, what should i do to make up? Help, quick