Oh Simon, I'm so sorry you are feeling this way. May I be so bold as to give you another way to possibly look at the situation?
I don't know if you are like me in this way, but I believe things happen for a reason. I believe that you have this "trap" job for a reason that you may not be able to understand at the moment, but in time will become clear to you.
I can see you are going through a very stressful and difficult time right now with the anniversary of your mum's passing and your nan being so gravely ill. There are times when our minds need to be used in other ways than worrying about personal situations. Working this 2 week job may be a way for your mind to deal with all that is going on around you. It may also be there to be used as an outlet for your anger and frustration too. I don't mean by being that way while at work, but it can be used as your outlet for your emotions right now. Does that make sense???
I know it sounds weird, but I truly believe you are meant to work right now. I know it's difficult because you want to be in other places with your family. I understand how it feels, I've been there before too. I hope you can find some peace with it all Simon.....really I do
Hugssss
J