Oh man

So my Mac I've been having problems with it when I tuen it on it has a blue screen and that's it ... It's not loading at all so I brought it in to the apple store thursday and picked it up that night after my classes to go all the way home to find out it still does not work now I brought it back and found out that I need a whole new hard drive and they didnt have any in stock sucks so much now I have to wait a whole week till they get the part and now it's going to be so hard for me to do my papers for school so upset