There has to be some help from the county you live in! Get yourself down to Social Services and tell them what's happening. Every city has a food pantry, if you have no car see if someone will deliver. If you're on FB just ask for groceries. Honey how come your mom was not taking care of your grandma (and I'm sorry for your loss) I think your mom must have some real challenges too? How come she's not able to care for you? You're gonna have to really get tough and take care of yourself my dear! Ain't no one gonna rescue you, you have to rescue yourself. Very best of luck to you!!