Sorry to hear this artsygirl
Without being dismissive I had some incredibly mundane jobs whilst studying after school - none of them which I liked at all (I can think of some I hated) whilst working towards my degree so ughhhhhh I feel your pain
Moving back in with parents isn't necessarily a joy after you've had this independence for so long.
I'll be holding thumbs for you that you do get the job where you had the interview; even if it means that you have to supplement it with another job ....
Let us know how you go!