Sweetie i think what u described, the fight between your parents, is very normal, unfortunately parents dont always realise the emotional damage it does to their kids to c them fighting in front of them.
We are all human and even parents make mistakes, and we dont all get along 100 per cent of the time.
Sorry its so hard on you, i am an oldie now, and my parents still fight, even though i dont live at home, i get phone calls about it all the time, and the pressure i feel being stuck in the middle is enormous.