Please help me........?

my parents always argue and its really getting on my nerves....so I have tried to stop them but they shouted at me and I ended up so upset I have been diagnosed with depression and I want to stop them but not even the fact that their daughter has an illness has stopped them...any idea's please help me and my brothers are completely sick of it my oldest brother is 14 and my youngest brother is 8 he doesnt seem to notice it as much as he is still young but it is still effecting him....what shall I do I feel I should do something to help as I dont want my brother to end up with some mental problem like me :(