I dreamt I had to commit suicide?

It was kind of a sweeney todd dream in a way but it was much, much, more serious. it was like the nightmare of sweeney todd. believe me, this was serious, though. there was a crazy lady that came to my school and she wanted to turn us all into cannibals. she forced us to kill our mothers so she could put them into the pot. i was scared, so i killed my mother (God knows why I didn't just run away with her) and then i killed myself.....i slit my throught. i sat there with my throught slit and saw blood gushing out. i didn't know what to do and wondered why i did it. i think i was able to breathe. does anyone know what this means about dying? i also heard music in my head singing "sweeney todd.....sweeney todd.....sweeney todd" i was like....what on earth? it was creepy