I'm in college and have more than my fair share of friends in similar situations to you. I have no idea where you live, but have you looked into plasma donation? Where I'm at, you show up and donate for an hour and you get paid $30 on the spot. Plus you can do it twice a week, so that's over $200 a month for hardly any time at all. If there is a university near you, check and see if they are looking for guinea pigs for any studies.
And finally, a quick google search can help you find any governmental/local assistance programs that may be there to help you out, assuming you qualify.
Good luck, hun. I'm sure things will be looking up soon!