I had the same situation as you when I was in nursing school
I moved out at 17, to go to college.......I never had any help, cause my parents didn't have the extra $ and they didn't go to college, so I don't think they understood what it was like. Although I am sure they would have helped if they could have.
From 17-20 years old, I was living with my (ex) bfriend, so it was smoother, I broke up and moved out at the same time as my parents separated. I had to move in with my aunt for 6 months and start from zero again, cause I had nothing! I was making $8 Canadian an hour at Sears. I remember really bad living conditions to be in nursing school.
It was so hard, that I took over a year off, and I was going to give up. In that year, I got a job paying over double than Sears, and it was a lot easier. I worked 15 hours a week and I was able to get by. At 22, I moved in with my current bfriend, and went back into nursing school and together things worked out great, he was in University also at the time. We both graduated, this past Spring. (Although his grad ceremony is next week).
If I can give you any advice, don't work too much......or your schooling will suffer, Try not to take out too many student loans (I had $6000 in loans when I lived with my ex........of course when I really needed it when I was alone, I was not entitled!)
Don't be afraid to finish the program over a longer period of time, if your situation is that bad. I did it over 4 and a half years, and I still have the same diploma as everyone else and I am 25 years old, not too old I guess.
Hang in there!!! Believe me, it feels TOTALLY AMAZING to get that diploma and your licence, especially if you did it all on your own. You can do it!!!