You need to buy yourself some breathing room. So honestly, pack up your stuff and move to your mothers. It may not be ideal, and it may suck for you, but it isn't going to suck more than living on the street. Move in with your mom, and start putting things together. Get your GED, and start searching for jobs hardcore. Starbucks is actually pretty good for people in your situation. Health care, and decent wages. Here's another idea. Barber school. That may sound a little weird, but you can actually make alot of money doing it. You can get decent commission alot of times, and you'll have cash in your pockets on top of that from tips.
Thing is, don't make yourself sick over it. You're young, in a little bit of a bind, but you'll get through it. Most people your age now haven't even tried living on their own. At least you're trying. Talk to your landlord also. You never know. Especially if he/she has alot of properties, perhaps there is a way you can work off your balance doing work for them. But if that's not likely, then like I said. Pack your things up and move back home. It will give you a little room to breathe and focus on the next step.