I got into a car accident?

Hey everyone. I got into a pretty bad accident today while driving my parent's car. It was my fault. The car is badly damaged, maybe even totaled. I don't know what to do. My mother's just glad that I'm ok, but my father... He's been screaming and swearing constantly at my mother (for defending me) and me for days now. He's not even sleeping in the same bed as my mother (it's a first). The guilt I feel is absolutely overwhelming; not only have I done some serious damage to my father's car, but the accident has caused a rift in my parent's relationship. I told them that I would pay for every cent of the damage, to his car and the other car involved, but it makes no difference. I am 18 years old; I don't party, I hardly ever go out, I have the highest marks in my grade - so it's not like I have made a habit out of being careless and irresponsible. I am so down right now, I have depression and an anxiety disorder and I am really buckling under the weight of this. Please, someone help me.