My dad is inconsiderate?

Today, he asked if I could help him hook his music up. Prior to this, I had had a 2 hour long conditioning session, and I was dead. Along with this, I was suffering a horrible stomach pain called (Crohn's Disease, and my pain was unbearable on this day) I told him I would show him how to operate the machine, as it was down two floors, but he cut me off with "You're so lazy, I don't care if you're tired." I thought it was rude that he cut me off and was so harsh, so I got irritated. I told him that I was in pain, and I was very tired. He refused to watch me show him how to turn on his music, and said I was useless. I'm really mad at this point, it's been a long damn day, and I let the words slip "F you." I admit, that was wrong, and I didn't mean to say words so harsh. He then began yelling at me, telling me to go downstairs or he would kill me. I, of course, started crying, and he told me he would beat me to death with his belt for being a b*tch. My mom stopped him in time, but I was still angry, as he treats me like his slave everyday, and always tells me degrading things.